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October 31, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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French
Is this paragraph correct? Would someone mind editing it for me? La derniere semaine, une partengue a piqué Steve Irwin quand il a nagé à la nord de l'Australie. Steve Irwin est mort de la poison. Il n'y a pas d'un accident. La partengue a &...
Sunday, April 15, 2007 at 2:42pm

earth science
how can the interactions between the earth systems affect the climate?? any one help me i dont knw where to start and i need to write 700 words on it Step one is to read your S103 course materials rather than try to get someone else to answer it for you.
Saturday, April 14, 2007 at 7:14pm

Chemistry
Use these answers for questions 4 - 7. (A) 1s2 2s22p5 3s23p5 (B) 1s2 2s22p6 3s23p6 (C) 1s2 2s22p62d10 3s23p6 (D) 1s2 2s22p6 3s23p63d5 (E) 1s2 2s22p6 3s23p63d3 4s2 4. An impossible electronic configuration 5. The ground-state configuration for the atoms of a transition element ...
Thursday, April 12, 2007 at 11:00pm

Electric forces
An electron is released above the earth's surface. A second electron directly below it exers just enough of an electric force on the first electron to cancel the gravitational force on it. Find the distance between the two electrons. I thought if I just set the ...
Wednesday, April 11, 2007 at 7:46pm

calcq
2- The earth’s atmospheric pressure p is often modeled by assuming that the rate dp/dh at Which p changes with the altitude h above sea level is proportional to p. Suppose that the pressure at sea level is 1013 millibars (about 14.7 pounds per square inch) and that the ...
Wednesday, April 11, 2007 at 7:18pm

calc
2- The earth’s atmospheric pressure p is often modeled by assuming that the rate dpdhat Which p changes with the altitude above sea level is proportional to hp. Suppose that the pressure at sea level is 1013 millibars (about 14.7 pounds per square inch) and that the ...
Tuesday, April 10, 2007 at 11:52pm

earth's systems
What are the four earth systems? and how do they interact with eachother? Lithosphere, Biosphere, Atmosphere, and Hydrosphere. They operate in an integrated fashion. I recommend you cite some specific interactions. all of the systems work together by air masses
Tuesday, April 10, 2007 at 6:07pm

Astronomy
Calculate the ratio of the escape velocities from the moon and Earth. Calculate the ratio of the escape velocities from the moon and Earth In order to escape the gravitaional pull exerted by a central body on an orbiting object, it must must achieve a minimum inertial velocity...
Tuesday, April 10, 2007 at 3:57pm

Astronomy
A cinder block can be weightless in space. Would you want to kick it with your bare foot? Even If it is weightless, does it have mass? An astronaut, circling the earth in the Space Shuttle, senses that his apparent weight is zero. He cannot feel the normal earthbound sensation...
Tuesday, April 10, 2007 at 3:56pm

Physics please check
As you climb a mountain, your ears "pop" because of the changes in (a) In which direction does your eardrum move as you climb up? inward outward eardrum does not move Give your reasoning. I think the eardrum moves outward because the further you go away from the ...
Monday, April 9, 2007 at 12:43am

physics
An asteroid, whose mass is 2.0 10-4 times the mass of Earth, revolves in a circular orbit around the Sun at a distance that is 2.9 times Earth's distance from the Sun. (a) Calculate the period of revolution of the asteroid in years. (b) What is the ratio of the kinetic ...
Sunday, April 8, 2007 at 1:13pm

physics
An asteroid, whose mass is 2.0 10-4 times the mass of Earth, revolves in a circular orbit around the Sun at a distance that is 2.9 times Earth's distance from the Sun. (a) Calculate the period of revolution of the asteroid in years. (b) What is the ratio of the kinetic ...
Sunday, April 8, 2007 at 12:48pm

earh science
earths early atmosphere formed during the archean era. Which gas was generally absent from the atmosphere at this time http://en.wikipedia.org/wiki/Earth's​_atmosphere#Evolution_of_the_Earth.27s_a​tmosphere
Friday, April 6, 2007 at 12:52pm

Religion-Islam-Al-Quran
There seems to be no one here who is familiar enough with the Quran to answer you at this time. You are certainly free to use any search engine, but be aware that you will find conflicting and confusing results, as with most online searches. http://www.google.com/search?q=...
Thursday, April 5, 2007 at 6:01am

earth science
what is the most common sedimentary rock? Since this is not my area of expertise, I searched Google under the key words "sedimentary rock common" to get these possible sources: http://www.cartage.org.lb/en/themes/Scie​nces/Earthscience/Geology/RocksandMinera&#...
Wednesday, April 4, 2007 at 2:34pm

earth science
what class of minerals contains the element oxygen bonded to a metallic element http://en.wikipedia.org/wiki/Iron_oxide
Wednesday, April 4, 2007 at 2:24pm

earth science
24. emormous masses of ____ rock all over the world, such as the Columbia Plateau in the northwestern U.S., give evidence of some huge catastrophic action. granite mountainous sedimentary volcanic volcanic right? Yup.... absolutely
Wednesday, April 4, 2007 at 12:49pm

earth science
22. an illustration of the fact that a sudden and great _____ struck the earth is the millions fo mammoths and other large animals frozen instantly and preserved, whole and undamaged. catastrophe cold front ice age permafrost ice age right This also makes good sense.
Wednesday, April 4, 2007 at 12:41pm

earth science
21. Billions of fossils of plants, fishes, and land animals, many almost perfectly preserved, could not have been buried by natural _______ observable in the world today. DEATHS DISEASES EVELOUTION PROCESSES processes right? That makes good sense to me.
Wednesday, April 4, 2007 at 12:23pm

Earth
1. The great galaxy in Andromeda has an angular diameter along its long axis of about 5^0. Its distance is about 2.2 million light years. What is its linear diameter? angle*distance= arc distance. You need the angle in radians to do this.
Tuesday, April 3, 2007 at 9:37pm

Geography.../what does this mean?
" The earth's physical landscape is the result of conflict between forces..." Explain what this means. Thanks. Is it possible that forces move Earth around, sometimes the movement is opposing another landforce, they collide, and one slide under?
Tuesday, April 3, 2007 at 8:54pm

Physics HELP!!!!!!!!
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ...
Tuesday, April 3, 2007 at 6:33pm

Earth
1. If the Earth were the size of B-B (with a radius of about 0.2 centimete), how big would the Sun be? How big would the Milky Way be? 2. Imagine building a model of the Solar System on your campus. Work out the diameter and spacings of the planets in millimeters and meters ...
Tuesday, April 3, 2007 at 5:52pm

astronomy
1. The radius of the Sun is 7 X 10^5 kilometers. Use powers of ten to show that the Sun's radius is about 100 times the Earth's radius. 2. Given that an astronomical unit is 1.5 X 10^8 kilometers and a light-year is about 10^13 kilometers, how many AU are in a light-...
Tuesday, April 3, 2007 at 5:50pm

chem
Forty miles above the earth's surface the temperature is 250 K and the pressure is only 0.20 mm Hg. What is the density of air (in grams per liter) at this altitude? (Assume the molar mass of air is 28.96 g/mol.) PV=nRT n/V= molar desity= P/RT mass density= molar density*...
Friday, March 30, 2007 at 1:27am

Physical Science
From a general relativistic point of view, a person on the ground floor of a skyscraper ages...faster or slower than a person on the top floor? With the faster movement of the rotation of the earth at the higher altitude, the person on the ground floor would age faster than ...
Thursday, March 29, 2007 at 10:14pm

Physics- drwls please help
(a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year is about 9.33 109 J. (...
Wednesday, March 28, 2007 at 6:52pm

science
What star other than the sun is closest to the earth? Proxima Centauri, which is part of the alpha Centauri three-star system
Wednesday, March 28, 2007 at 5:17pm

Physics
Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year is about 9.33 109 J. ...
Wednesday, March 28, 2007 at 12:40pm

Physics
A ball is tossed straight up from the surface of a small spherical asteroid with no atmosphere. The ball goes to a height ewual to the asteroid's radius and then falls straight down towardd the surface of the asteroid. What forces if any act on the ball while it is on the ...
Monday, March 26, 2007 at 6:41pm

science
where can you see earth's atmospere clearly Well, you can see light that is scattered from microscopic dust particles in the atmosphere during the day from any point: That blue color of the sky is that scattered light.
Monday, March 26, 2007 at 4:01pm

Science
Why is an extra day added to February every four years? It is nice to have the calendar year the same as the Earth's orbit around the Sun. It takes 365 1/4 days to go around the sun...so, each four years, we add a day to correct the calendar. Thanks Bob!
Sunday, March 25, 2007 at 11:11am

PLEASE HELP SOLVE RIDDLE
I jump I run, I am one of four, you can find me hanging around your door. What am I? Please help I'm usually great at answering these. But I am lost on this one. PLEASE tell us if you get the answer :) what weighs a lot going forward but not backwards? Two men occupy ...
Friday, March 23, 2007 at 7:44am

Geog
2- at sea level the air temperature is 80 degree F. this air reaches the dewpoint at 6,000’. The air continues to rise, pushed up by trade winds, over a mountain that is 12,000’ high. If the dry adiabatic rate is 5.5 degree F/ 1000’ and the wet adiabatic rate is...
Thursday, March 22, 2007 at 10:23pm

Science
I would like to know does this statement makes a good hypothesis for my paper(or)can someone give me some type of insight on how to word it correctly. "My paper will prove that homosexuality is a phenomenon that maybe due to biological factors, enviromental infulences or ...
Thursday, March 22, 2007 at 4:28pm

Re: Physics - drwls #2
Posted by winterWX on Monday, March 19, 2007 at 11:54pm. A small block of mass m = 4.0 kg can slide along the frictionless loop-the-loop. The block is released from rest at point P, at height h = 23R above the bottom of the loop (R is the radius of the loop). Express your ...
Thursday, March 22, 2007 at 3:01am

physics
A pendulum clock that works perfectly on Earth is taken to the Moon. (a)Does it run fast or slow there? (b) if the clock is started at 12:00:00 am, what will it read after one Earth day(24hrs)? Assume that the free-fall acceleration on the Moon is 1.63 m/s^2 I tried to do this...
Wednesday, March 21, 2007 at 4:33pm

English
Last one for today! (Thanks for all the help guys) Do these sentences mean the same? "Wheeling to their stations in the sky, the stars make the poor world-fret of no account." And "Wheeling to their stations in the sky, the stars make the world forget about its ...
Wednesday, March 21, 2007 at 9:46am

English
Hi. I need help understanding the following sentence. "And yet--and yet--is it not perhaps to satisfy expectation that one falls into the tragic key in writing of desertness? The more you wish of it the more you get, and in the mean time lose much of pleasantness." ...
Wednesday, March 21, 2007 at 8:39am

English
Hi. I need help understanding the following sentence. "And yet--and yet--is it not perhaps to satisfy expectation that one falls into the tragic key in writing of desertness? The more you wish of it the more you get, and in the mean time lose much of pleasantness." ...
Wednesday, March 21, 2007 at 7:26am

science NEED BY TOMMOROW MORNING AT 9:30!!
Can you tell me who figured out the earth was round and why they wanted to? THNX :) Please check this site for your information. http://www.madsci.org/posts/archives/nov​99/942957483.Sh.r.html People have always been curious and wanted to know about their environment.
Tuesday, March 20, 2007 at 6:28pm

Physics - drwls?
A small block of mass m = 4.0 kg can slide along the frictionless loop-the-loop. The block is released from rest at point P, at height h = 23R above the bottom of the loop (R is the radius of the loop). Express your answers in the form ngR, where n is the number you will ...
Monday, March 19, 2007 at 11:54pm

science
I am studying science at GCSE. I a working through a revision book and have come across a question which i am unsure of the answer. The question is, "state the number of different elements present in C6H5CO2Na." The answer i have is 14 but still i am unsure. Please ...
Monday, March 19, 2007 at 4:07pm

Science
Granite is an intrusive, felsic rock, which may be produced by partial melting or fractional crystallization. Explain how these processes can produce felsix magmas from more mafic parent magmas. Since this is not my area of expertise, I searched Google under the key words &...
Monday, March 19, 2007 at 9:48am

BIO ?'s
Why is life based upon the cell? More or less, why are cells necessary for life? Is there a limit to how large a cell can be? ** If anyone can help or just give me an idea to go on for this it would be helpful! Even a good site to start research! THANKS! There may be life ...
Sunday, March 18, 2007 at 9:04pm

Science
Why is the human population of the Earth still growing rapidly even though birth rates have begun to fall slightly? Due to better health and medical advancements, people are living longer.
Sunday, March 18, 2007 at 8:29pm

Science
[I picked d.] How many species are estimated to be living on earth? a.between 10,000 and 1,000,000 b.between 500,000 and 1 million c.between 1 and 5 million d.between 10 and 50 million http://faculty.plattsburgh.edu/thomas.wo​losz/howmanysp.htm This is a political, not ...
Sunday, March 18, 2007 at 3:21pm

science
As an environmental science teacher, how would you respond to someone who tells you (a) that he or she does not believe in biological evolution because it is "just a theory"? How would you respond if another student states, (b) we should not worry about air pollution...
Thursday, March 15, 2007 at 10:03pm

science
I need to know about the wind patterns, tides/high and low,or upwelling for the north sea,irish sea,and the bay of biscay Thank you for using the Jiskha Homework Help Forum. Here is what I find: 1. http://gpc.edu/~pgore/Earth&Space/GPS/wa​ves-currents-tides.html 2. http...
Wednesday, March 14, 2007 at 10:05am

Physics
A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Each time the pulsar makes one revolution, the rotating beam sweeps across the earth, and the earth receives a pulse of radio waves. For one particular pulsar, ...
Wednesday, March 14, 2007 at 1:37am

earth science
Info on the largest earthquakes http://earthquake.usgs.gov/regional/worl​d/historical.php
Tuesday, March 13, 2007 at 10:36pm

Earth Science
Please help me out with this question!: Explain how hurricanes form. http://en.wikipedia.org/wiki/Hurricane
Tuesday, March 13, 2007 at 10:08pm

science
how is the air we breath today different from 3.6 billion years ago? http://en.wikipedia.org/wiki/Earth's​_atmosphere#Evolution_of_the_Earth.27s_a​tmosphere http://eesc.columbia.edu/courses/ees/cli​mate/lectures/earth.html
Tuesday, March 13, 2007 at 10:07pm

Physics
A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Each time the pulsar makes one revolution, the rotating beam sweeps across the earth, and the earth receives a pulse of radio waves. For one particular pulsar, ...
Tuesday, March 13, 2007 at 2:40pm

science
The atmosphere is composed of a mixture of _______________, _____________ ____________, and tiny___________________. Thank you for using the Jiskha Homework Help Forum. The origin of our atmosphere is still open to a great deal of speculation. One theory is that the first ...
Monday, March 12, 2007 at 10:38pm

science
why do we find the major land biomes at specific locations on the earth in both the northern and the southern hemispheres? Variations in climate determine the biomes. These variations are determined by the frequency and direction of winds and ocean currents, along with ...
Monday, March 12, 2007 at 7:57pm

Earth Science
what is capillarity and runoff ? http://dictionary.reference.com/browse/c​apillarity http://dictionary.reference.com/browse/r​unoff
Sunday, March 11, 2007 at 8:13pm

2nd attempt Essay for Photography
I posted this before, but failed to paste the essay! oops.. haha. So here's the essay. Please proofread and critique and comment. I'm not so sure about the conclusion. It feels a little weak to me..thanks!!! People seek the answers of their own questions about their ...
Sunday, March 11, 2007 at 2:55pm

Physics
Zero, a hypothetical planet, has a mass of 1.0x10^23 kg, a radius of 3.0x10^6 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0x10^7 J, what will be its kinetic energy ...
Friday, March 9, 2007 at 10:31pm

Re: Physics/Math
Posted by Technoboi11 on Wednesday, March 7, 2007 at 1:09am. Zero, a hypothetical planet, has a mass of 1.0x10^23 kg, a radius of 3.0x10^6 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial ...
Friday, March 9, 2007 at 8:52pm

science I NEED HELP....WORTH 45%OF MY GRADE
wat is blasstoff like???? earth's orbit???????? wat do they do to stay healthy???? wat type of exercise do they do????? effect on weightlessness?????? atmosphere of the moon???? lunar soil adn craters???? transportation on the moon???????? science experiments??????? ...
Thursday, March 8, 2007 at 6:29pm

science
can u explain the wter cycle for me ? i wonder what precipitation means? http://www.onelook.com/ Type precipation in that window http://www.enchantedlearning.com/subject​s/astronomy/planets/earth/Watercycle.sht​ml
Wednesday, March 7, 2007 at 7:29pm

physic
What does “seven earths" as mentioned in surah at-Talaq actually mean?. what is each cointing on earth? please give detail answer.
Tuesday, March 6, 2007 at 9:48pm

science
Name at least two processes that change Earth's surface quickly.
Thursday, March 1, 2007 at 5:24pm

Science
There are more earthquakes along the western coast of the United States than along the eastern coast. Explain. thank you Where do earthquakes tend to occur, in terms of the tectonic plates of the earth? http://www.seismo.unr.edu/ftp/pub/louie/​class/100/plate-tectonics....
Thursday, March 1, 2007 at 5:21pm

physic
What does "seven earths" as mentioned in surah al-Talaq acctually mean? It means that, according to the Quran, Allah created seven heavens, each contining one earth.
Thursday, March 1, 2007 at 8:22am

PLEASE HELP! EARTH SCIENCE
What is the relative humidity of sample 2: Sample: 2 T(degrees)C: 32(degrees) Mass of Water Vapor: 14 g Mass of Water vapor at Saturation: 34 g please help me...i dont understand how to find this
Tuesday, February 27, 2007 at 9:31pm

Earth Science
What is the relative humidity of sample 2: Sample: 2 T(degrees)C: 32(degrees) Mass of Water Vapor: 14 g Mass of Water vapor at Saturation: 34 g please help me...i dont understand how to find this The relative humidity in this case is 14/34 = 41% It is always the ratio of the ...
Tuesday, February 27, 2007 at 8:58pm

envirnomental science
as an environmentalscience teacher, how would you respone to someone who tells you that he or she does not believe in biological evolution because it is just a theory, and we shoul not worry about air pollution because through natural selection, the human species will develop ...
Monday, February 26, 2007 at 11:46pm

Physics
A 7450kg satellite has an elliptical orbit. The point on the orbit that is farthest from the earth is called the apogee. The point on the orbit that is closest to the earth is called perigee. Suppose that the speed of the satellite is 2940m/s at the apogee and 8400m/s at the ...
Sunday, February 25, 2007 at 8:07am

science
a experiment to prove that a freely suspended or floating magnet always point in the north south direction plz help got my trails!??!?!?! how do i get the ans to this question?????? That doesn't look like a question. It looks like a suggested experiment to prove a ...
Sunday, February 25, 2007 at 4:54am

earth space science
how are each of the air masses related and/or different from each other? Are you talking about the various layers of the atmosphere?
Saturday, February 24, 2007 at 12:17pm

Science
Thank you! Why is there a lunar eclipse only twice a year and not once a month? Thanks for the help. On the night of May 15/16 we will be able to see a total lunar eclipse. Lunar eclipses can only happen when the Moon is full and it passes behind the Earth and into its' ...
Monday, February 19, 2007 at 9:07pm

Physics
The emf induced across the wing-tips of a flying aircraft is of the order of several millivolts. Can this value be obtained using a sensitive millivoltmeter connected across the wing-tips? Explain your answer. Not if connections are actually made to the wing tips. The wires to...
Monday, February 19, 2007 at 9:04am

science
the acceleration of gravity on the surface of Mars is m/s squared. if an astronaut in a space suit can jump upward 20cm on the earth's surface, how high could he jump on the surface of Mars? You need to provide a number for the acceleration of gravity on Mars, which I will...
Monday, February 19, 2007 at 2:07am

Geography
What two methods are used to represent features on the earth? On a physical map, shades of black to light gray or various colors can show elevations. On three-dimensional maps and globes, the mountains are raised slightly above the oceans.
Sunday, February 18, 2007 at 4:32pm

physics (check my answers)
When the nuclear fuel in the sun is gone, the sun will collapse to a a. black hole b. white dwarf c. supernova d. neutron star My answer: I think its a black hole. If the mass of the Earth were suddenly doubled while the radius was unchanged, your weight would be? My answer: ...
Saturday, February 17, 2007 at 6:38pm

Physics
What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 186 km? What is the period of revolution? winterWX, Friday, February 16, 2007 at 9:36pm So GMm/r^2 = mv^2/r and I know that I need to solve for v but what do I use for the mass of the ...
Friday, February 16, 2007 at 11:31pm

Physics
A orbiting satellite stays over a certain spot on the equator of (rotating) Earth. What is the altitude of the orbit (called a "synchronous orbit")? Write the equation for the period of a satellite in terms of the distance from the Earth's center. It is a special...
Friday, February 16, 2007 at 4:31pm

Physics
What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 186 km? What is the period of revolution? So GMm/r^2 = mv^2/r and I know that I need to solve for v but what do I use for the mass of the satellite? Do I just plug in values for G, M, m ...
Friday, February 16, 2007 at 4:30pm

Physics help----------thanks
A charged cloud system produces an electric field in the air near the Earth's surface. A particle of charge -2.2 10-9 C is acted on by a downward electrostatic force of 3.0 10-6 N when placed in this field. (c) What is the magnitude of the gravitational force Fg on the ...
Thursday, February 15, 2007 at 5:02pm

Physics
In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 600 N, to ...
Wednesday, February 14, 2007 at 10:51pm

Physics
In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 600 N, to ...
Tuesday, February 13, 2007 at 10:17pm

algebra 1 scale drawing
On a scale drawing of steps with the base being 1 3/4 inches and the steps going up 1/4 inch each on the drawing.Which scale was used for the drawing if the actual height of each step is 6 inches? A. 1/8 = 1 foot, 10 ines the are hard as heck 2 its hard and yet my teacher isn...
Tuesday, February 13, 2007 at 9:33pm

Earth Science
What is the name of scientists who study earthquakes?? ♥ thanks Seismologists
Tuesday, February 13, 2007 at 9:20pm

Science
As an environmental science teacher, how would you respond to someone who tells you (a) that he or she does not believe in biological evolution because it is "just a theory," and (be) we should not worry about air pollution because through natural selection, the ...
Tuesday, February 13, 2007 at 1:36am

Physics/Math
A certain string can withstand a maximum tension of 43 N without breaking. A child ties a 0.37 kg stone to one end and, holding the other end, whirls the stone in a vertical circle of radius 0.91 m, slowly increasing the speed until the string breaks. Where is the stone on its...
Monday, February 12, 2007 at 9:51pm

physics
I need some help and I was wondering if you guys could give me some hints and stuff. thanks a lot!! Question 1 A force causes a certain acceleration. What acceleration would half of the original force cause? a. The same amount b. 1/2 times c. 4 times d. 2 times Question 2 How ...
Sunday, February 11, 2007 at 5:20pm

Geology (college level)
What is the process by which elements form? In the stars, fusion mainly. On Earth, radioactive decay. For further reading: http://www.longman.co.uk/tt_secsci/resou​rces/scimon/hoyle/hoyle.htm BIG BANG NUCLEOSYNTHESIS WAS THE FIRST PROCESS OF ELEMENT FORMATION Can some ...
Friday, February 9, 2007 at 8:52pm

science
What steps do you think can be taken to reduce the harmful effects of human activities on biogeochemical cycles? Which businesses would these changes impact the most? To assess the harmful effects of human activities, you first need to know about the biogeochemical cycles. ...
Thursday, February 8, 2007 at 9:32pm

enviromental science
what is in a region of long-term atmospheric conditions Sulfur dioxide in the upper atomsphere cand lead to the formation of what that reduce the amount of sunlight reaching the surface of Earth
Thursday, February 8, 2007 at 6:26pm

social!
To what extent should societies attempt to meet present needs, and to what extent should they try to provide for the future to the extent that they provide enough needs for now, and what is left is left. Theres old/extremist political views called libertarianism and socialism...
Friday, February 2, 2007 at 12:11pm

relative velocity
A radar antenna is tracking a satellite orbiting the earth. At a certain time, the radar screen shows the satellite to be 159km away. The radar antenna is pointing upward at an angle of 59.3 from the ground.Fine the x and y components(in km) of the position of the satellite ...
Thursday, February 1, 2007 at 4:35pm

Earth Science
A region of ocean water having the same temperature and salinity throughout is what??
Wednesday, January 31, 2007 at 9:00pm

Geog
In one Minute of time, how does the earth rotate in minutes or seconds of longitude? rotation=360 degrees/ number minutes in the day. 360/1440 = 0.25 is that the right answer
Wednesday, January 31, 2007 at 8:02pm

Geog
if each time zone is 15 degrees in width who many time zones are there around the earth? Simple math problem. There are 360 degrees around the world. Divide 360 by 15.
Tuesday, January 30, 2007 at 9:30pm

Geog
In one minute of time how far does the earth rotate in minutes or seconds of longitude? Please use the answer I posted in my last answer to calculate this answer.
Tuesday, January 30, 2007 at 9:20pm

Geog
How many minutes does it take for the earh to rotate through 1 degree of longitude? The earth has 360 degrees of longitude. It rotates every 24 hours. There are 1440 minutes in a day. Divide 1440 by 360 to get your answer.
Tuesday, January 30, 2007 at 9:16pm

Physics
100000W of power is delivered to the other side of a city by a pair of power lines with the voltage difference of 15000V. a) how much current flows in the lines? 100000/15000 = 6.9 A b) Each of the 2 lines has a resistance of 10 ohms. What is the voltage change along each line...
Tuesday, January 30, 2007 at 8:57pm

physics
Halley's comet moves about the sun in an elliptical orbit with its closest approach to the SUn being .59AU and its greatest distance being 35AU (1AU=Earth-sun distance) if the comet's speed at closest approach is 54km/s what is its speed when it is farthest from the ...
Monday, January 29, 2007 at 4:20pm

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