Thursday
December 8, 2016

Homework Help: Science: Earth

Recent Homework Questions About Earth

Physics help
1. The fundamental force that: (4 marks) ____ 1. causes hair to stand on end after being rubbed by a balloon a) strong nuclear ____ 2. causes protons to remain in the nucleus despite repulsive forces b) weak nuclear ____ 3. controls the planets' orbit around the sun c) ...
Thursday, February 4, 2016 by Matt Damon

science help PLS
An astronomer see a star that is very far away but still very bright. What can she conclude about the star? The star must be very large. The star must be very small. The star must be moving away from Earth. The star must be moving closer to Earth.
Thursday, February 4, 2016 by Oscar

Social Studies
In what way is geography an integrative science? a. Geography is an integrative science because it examines Earth in both physical and human terms.*** b. Geography is an integrative science because it borrows from physical sciences such as chemistry, biology, meterology, and ...
Thursday, February 4, 2016 by Kaai97

Social Studies
What does “geography” mean in literal sense? a. the study of the human elements of Earth b. to describe Earth*** c. the study of the physical elements of Earth d. none of the above
Thursday, February 4, 2016 by Kaai97

PLEASE CHECK IF THEY ARE CORRECT!!! THANKS
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromosphere*************** Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and...
Thursday, February 4, 2016 by Girl with questions.

Algebra
Your weigh on the moon is about 1/6 of your weigh on earth. Write and solve an equation to show how much a person weighs on earth if he weighs 16 lbs. on the moon .
Wednesday, February 3, 2016 by Ella

physics
It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian rocks have come to Earth ...
Monday, February 1, 2016 by tom

physics
Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.'
Monday, February 1, 2016 by ang

physics
Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.
Monday, February 1, 2016 by ang

Science
What is the centripetal acceleration a satellite is orbiting the Earth at an altitude of 300.22 km?
Monday, February 1, 2016 by Jack

geology
list down six techniques used to transfer heat from the earth crust to the surface by fluid circulation
Monday, February 1, 2016 by kasiama

earth science
The global ocean covers about 70% of the Earth’s surface. If all the ocean water was uniformly distributed over the whole surface, what would be its depth? Assume that the Earth is a perfect sphere, and the average ocean depth is 4 km.
Sunday, January 31, 2016 by Marisa

engineering
In many engineering uses, the value of �g�, the acceleration due to gravity, is taken as a constant. However, g is actually dependent upon the distance from the center of the Earth. A more accurate expression for g is: g=g0(Re/Re+A)^2 Here, g0 is the ...
Sunday, January 31, 2016 by Seth

physics
Imagine a parallel universe in which the electric force has the same properties as in our universe but there is no gravity. In this parallel universe, the sun carries charge Q, the earth carries charge −Q, and the electric attraction between them keeps the earth in orbit...
Sunday, January 31, 2016 by jack

Science
An artificial satellite circles around the earth at the height where the gravitational force is one fourth of that at earth's surface. If the earth's radius is R the height of the satellite above the surface of the earth is?
Sunday, January 31, 2016 by Shubham

analytic geometry
1. The orbit of the earth is an ellipse with the sun at a focus, the semi-major axes 93 million miles and the eccentricity is 1/60. Find the greatest and least distance of the earth from the sun. 2. A battle shipping is sailing at a straight line towards east at 40km/hour from...
Saturday, January 30, 2016 by sylvia

Sociology
For question #3, reference the videos "History of the Most Cajun Place on Earth"and “Music & Culture in the Most Cajun Place on Earth” A) Briefly describe the formation of the Cajun culture as an American subculture in the context of historical events and ...
Friday, January 29, 2016 by Rae

Physics
On earth, two parts of a space probe weigh 14500 N and 6400 N. These parts are separated by a center-to-center distance of 19 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far ...
Friday, January 29, 2016 by Melanie

English
Crossing the Sea A verdant rain forest rises out of the ocean to snow-capped peaks. Powerful fiords snake their way into glacial valleys. Rivers roar and meadows blossom. Many consider the land of New Zealand to be among the most beautiful places on Earth for centuries that ...
Thursday, January 28, 2016 by Kaai97

English
Crossing the Sea A verdant rain forest rises out of the ocean to snow-capped peaks. Powerful fiords snake their way into glacial valleys. Rivers roar and meadows blossom. Many consider the land of New Zealand to be among the most beautiful places on Earth for centuries that ...
Thursday, January 28, 2016 by Kaai97

Physics
an airplane has a velocity of 499 km/h relative to the moving air. at the same time, a wind blows northward with a speed of 87 km/h relative to the earth. the airplane is moving in an easterly direction relative to the earth. find speed of airplane to relative to earth.
Thursday, January 28, 2016 by S

Science
Check my answers!! Plz 1. What would happen to an object if the force of gravity on Earth was decreased by half? (1 point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a ...
Thursday, January 28, 2016 by Vanessa

English
In the movie "Like Stars on Earth," we can see the names 'Nikumbh' and ' Awasthi.' They are main characters in the Indian movie. How do you pronounce the two names? Do you pronounce 'bh' in Nikumbh'?
Thursday, January 28, 2016 by rfvv

language arts
Label as Cause & Effect 1. (Effect) When dropped, cats land on their feet. (Cause) Cats are extremely agile creatures 2. (Cause) Few mammals can care for themselves at birth. (Effect) Most mammals are born immature 3. (Effect) The sun has a powerful gravitational force (Cause...
Wednesday, January 27, 2016 by NEED HELP -

Science Plzz correct me!!!
What would happen to an object if the force of gravity on Earth was decreased by half? (1 point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a heterogeneous mixture? (1 point) ...
Wednesday, January 27, 2016 by Samantha

Science
1. What would happen to an object if the force of gravity on Earth was decreased by half? (1 point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a heterogeneous mixture? (1 ...
Wednesday, January 27, 2016 by Samantha

science
why does the sun appear to move westward across the sky during the day? a) because earth rotates to the east b) because earth rotates to the west c) because the sun moves in a westerly direction d) because of the way you are looking into the sky
Wednesday, January 27, 2016 by need help

Physics
A 6.80 x 10^4 kg space shuttle moving at 7.90 x 10^4 m/s reenters the earth's atmosphere 80.0 km above the earth's surface. What is the shuttle's total mechanical energy with respect to earth's surface? I know the answer is E= 2.173 x 10^12J But I don't ...
Wednesday, January 27, 2016 by Danny

Physics
An 1750 kg weather satellite moves in a circular orbit with a gravitational potential energy of 1.69 x 10^10 J. At it's location, free-fall acceleration is only 6.44 m/s^2. How high above Earth's surface is the satellite?
Tuesday, January 26, 2016 by Selena

science help PLS
Which of the following correctly describes a way in which Earth’s atmosphere interacts with the hydrosphere? Living organisms breathe gases in the atmosphere. Water moves between Earth’s surface and the atmosphere. Gases in the atmosphere trap incoming solar ...
Monday, January 25, 2016 by Oscar

World History
How is Egypt and Ancient China different based on Religion and Philosophy (EXAMPLES: religious beliefs and practices, ideas regarding humans, life on earth and/or the after life) They are alike in many ways (polytheistic religion, Both believe there is life after death) but I ...
Monday, January 25, 2016 by WillWork4Help

physics
Estimate the average speed of the apollo spacecaft in m/s, given that the craft took five days to reach the moon from eaeth .the moon is 3.8*10 to the power 8m from earth.
Monday, January 25, 2016 by m adnan

Physics
An airplane has a velocity of 580 km/h relative to the moving air. At the same time, a wind blows northward with a speed of 92 km/h relative to earth. The airplane is moving in an easterly direction relative to earth. Find the speed of the airplane to relative to earth (answer...
Sunday, January 24, 2016 by Frank

Classical Mechanics
Approximate Lake superior by a circle of radius 162 km at a latitude of 47 degrees .Assume the water is at rest with respect to earth and find the depth that the center is depressed with respect to the shore due to the centrifugal force.
Sunday, January 24, 2016 by Anonymous

Pre-Calculus
Two cities are due north of each other. One city has a latitude of 32¢ª45'12" and the second city has a latitude of 51¢ª12'45". Assuming that the earth is a sphere with a radius of 4000 miles, how far apart are the two cities?
Sunday, January 24, 2016 by Rhodora

science
A spaceship of mass 2000kg is moving towards planet Earth. Calculate the magnitude of the force that the earth exerts on the spaceship when the spaceship is 100km above the surface of the Earth. The Earth has a mass of 6*10 to the power of 24 kg and a radius of 6,4*10 to the ...
Sunday, January 24, 2016 by zama

math
A trench 4 meter long ,2 meter wide and 3 meter high was dug into the ground.find the volume of the earth dug out for making this trench.
Sunday, January 24, 2016 by Mumtaz alam

science
Large craters are visible on the moon but not common on the earth's surface. Which of the following is the beady explanation of why large craters are not evident in the earth's surface in photos taken from space. A.three quarters of the earth's surface is covered ...
Saturday, January 23, 2016 by Tessy

Astronomy
"If the Sun were magically replaced with a giant rock that had precisely the same mass, Earth’s orbit would not change. Explain why not." I'm a little confused as to how to answer this. Is it because Earth doesn't orbit the exact center of the sun. ...
Saturday, January 23, 2016 by mc

physics
A body has mass 400kg on earth. What will be it mass on the moon if the Acceleration due to gravity is 9.8m/s2?
Friday, January 22, 2016 by Nyame Godfred

Science
A space probe on the surface of Mars sends a radio signal back to earth a distance of 8.66x0^7 km. Radio waves travel at the speed of light (3:00x10^8 m/s . How many seconds does it take the signal to reach earth
Thursday, January 21, 2016 by Sherri

physics
A baseball pitcher throws a baseball with a speed of 48 m/s . In throwing the baseball, the pitcher accelerates it through a displacement of about 3.5 m, from behind the body to the point where it is released how long was it in the air before returning to earth?
Thursday, January 21, 2016 by linds

Science
A space probe on the surface of Mars sends a radio signal back to earth a t a distance of 8.66 x10*7 radio waves travel at a speed of light 3.00 x 10^8 . How many seconds does it take for it to reach earth
Thursday, January 21, 2016 by Sherri

Chemistry 101
The distance from the Earth to the sun is approximately 9.37 x 10^7 miles. How long does it take for light from the sun, to reach the earth? Speed of light is 3.00 x 10^8 m/s. Use dimensional analysis to solve.
Thursday, January 21, 2016 by Lilly

science
find the gravitational force exerted by the sun on a 70 kg man located at the earth's equator a)at noon when the man is closest to the sun. b)at midnight when he is futherst from the sun. c)calculate the diferrence in gravitational acceleration due to the sun between noon...
Thursday, January 21, 2016 by albert

SCIENCE ASAP HELP PLEASE
which of the following features make earth and venus similar to each other ? A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****
Thursday, January 21, 2016 by Courtney

English
The extreme poverty of Dakar, Senegal, in “Hip-Hop Planet” is best reflected in which image? a. “When I looked into his eyes, they were bottomless oceans.” b. “. . . it pulled me to the earth like a hundred-pound ring in my nose.” c. “. . . ...
Wednesday, January 20, 2016 by Kaai97

English
The extreme poverty of Dakar, Senegal, in “Hip-Hop Planet” is best reflected in which image? a. “When I looked into his eyes, they were bottomless oceans.” b. “. . . it pulled me to the earth like a hundred-pound ring in my nose.” c. “. . . ...
Wednesday, January 20, 2016 by Kaai97

Geography
List 10 countries wich pacfic ring of earth is found.
Wednesday, January 20, 2016 by Yaekob

physics
A person is standing at the edge of the water and looking out at the ocean (see figure). The height of the person's eyes above the water is h = 1.9 m, and the radius of the Earth is R = 6.38 x 106 m. (a) How far is it to the horizon? In other words, what is the distance d ...
Tuesday, January 19, 2016 by DEMETRIUS

Chemistry 101
The distance from the Earth to the sun is approximately 9.37 x 10^7 miles. How long does ti take for light from the sun to reach the earth? Speed of light is 3.00 x 10^8 m/s. Show work.
Tuesday, January 19, 2016 by Lilly

Chemistry
The petrol, can be represented by the formula of the octane rating, has earth specifies 704 g/L. Estimate the enthalpy variation when burning 28.5 liters of petrol, assuming energies of connection 0 = 0 (117 kcal) C = 0 (173 kcal) 0–H (111 kcal) C–C (83 kcal) C–...
Tuesday, January 19, 2016 by Anitta

Math
a satellite traveling in a circular orbit 2000 kilometers above the earth completes one orbit every 3 hours. assume the earth is a sphere and its radius is 6400 kilometers. find the angular velocity of the satellite
Tuesday, January 19, 2016 by Jade

Physics (Feilds)
Show that the gravitational potential at the surface of the Earth is -64 MJ kg-1, given the surface gravitational feild strength is 9.8 N kg-1 and the mean radius of the Earth is 6400 km.
Tuesday, January 19, 2016 by Sarah

Math
a satellite traveling in a circular orbit 2000 kilometers above the earth completes one orbit every 3 hours. assume the earth is a sphere and its radius is 6400 kilometers. find the angular velocity of the satellite
Monday, January 18, 2016 by Jade

Physics
The mass of a star in a galaxy far, far away, is 2.13 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 7.87 × 108 km. Treating this planet and star as particles, with each mass ...
Sunday, January 17, 2016 by Briana

Mechanics
A 500kg spaceship is in a circular orbit of radius 2Re above the earth a.how much energy is required to transfer the spaceship to a circular orbit of radius 4Re. b.discuss the change in potential energy,kinetic energy and the total energy of the system
Sunday, January 17, 2016 by Och

Physics
How does the weight of a body varies on earth surface?
Saturday, January 16, 2016 by Shayo

earth science
During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of _____. (1 point) Europe Gondwana Laurasia Pangaea
Friday, January 15, 2016 by freddy

SCIENCE HELP PLS
The density of gas particles in a section of Earth’s atmosphere decreases. Which of the following is the most likely explanation for this event? The air pressure in that section of Earth’s atmosphere decreased. The air pressure in that section of Earth’s ...
Friday, January 15, 2016 by Oscar

Science
Which of the following can be expected to occur as climate change continues on Earth? Decreased meltimg of sea ice Decreased migration of pests and pathogens Increased freshwater water sources Increased coastal flooding Is it A?
Thursday, January 14, 2016 by Abby

English
And yet the books will be there on the shelves, separate beings, That appeared once, still wet As shining chestnuts under a tree in autumn, And, touched, coddled, began to live In spite of fires on the horizon, castles blown up, Tribes on the march, planets in motion. “We...
Thursday, January 14, 2016 by mstv

Physics
The Earth exerts an 640 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N.
Wednesday, January 13, 2016 by Leah

science help
An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is brighter than the second star. Which of the following is a valid conclusion about the first star? It is larger than the second star. It is smaller than the second star. It is ...
Wednesday, January 13, 2016 by Oscar

English
1.) "Good fences make good neighbours." Spring is the mischief in me, and I wonder If I could put a notion in his head: "Why do they make good neighbours? Isn't it Where there are cows? But here there are no cows. Before I built a wall I'd ask to know ...
Wednesday, January 13, 2016 by English help please

Language
People have been making maps for hundreds of years. Christopher Columbus used maps when he sailed to the "New World." At that time, most people thought Earth was flat, and all of the maps they used were flat, too. Of course, Columbus's maps were not accurate, but...
Wednesday, January 13, 2016 by Estephania

Math
Earth weight is 5.9736 x 10^24 Kg and Venus is 4.8685 x 10^24 Kg. What is the combined weight of Earth and Venus ? a)10.8421 X 10^26 Kg b)10.8421 x 10^23 Kg c)10.8421 x 10^25 Kg d)1.08421 x 10^25 Kg
Wednesday, January 13, 2016 by asdflk;jasdfla;kjsdfl;

Social Studies
Experts argue that a significant water shortage by 2025 will be caused by a. rising ocean levels. b. drastic increase in water usage by humans.*** c. drastic increase in usage by a growing animal population. d. raging, out-of-control wildfires that are spreading throughout ...
Monday, January 11, 2016 by Kaai97

physics
An object in space is initially stationary relative to the Earth. Then, a force begins acting on the object, starting with a force of 0 N, and increasing at a uniform rate until the magnitude of the force is 58 N after the force has acted for 25 s. The body has a mass of 10 kg...
Monday, January 11, 2016 by jungtaesoo

Physics
if mars orbits the sun at an angular velocity of 1.06x10-7 rad/s, how long is a year on mars in earth days assuming it travels in a circular orbit?pls explain
Sunday, January 10, 2016 by Allen

Math
Mercury's average distance from the sun is 57,910,000 km. The Earth is approximately 93,000,000 miles from the sun What would be the distance of a trip from Mercury to Earth, via the Sun. Look out for the units!!! (1 km =(0.62mi) Use Scientific Notation to solve this ...
Sunday, January 10, 2016 by Howayda

Math
The speed of light is 3¡Á¡¼10¡​½^8 meters/second. It takes 5¡Á¡¼10¡​½^2seconds for light to travel from the sun to the earth. What is the distance in meters between the sun and the earth...
Sunday, January 10, 2016 by Howayda

mechanics
please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re...
Saturday, January 9, 2016 by collins

mechanics
please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re...
Saturday, January 9, 2016 by collins

mechanics
please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re...
Friday, January 8, 2016 by collins

physics
(1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), where Re is the radius of the ...
Friday, January 8, 2016 by Anonymous

physics
(1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), where Re is the radius of the ...
Friday, January 8, 2016 by collins

physics
(2). Determine the velocity which a body released at a distance r from the center of the earth when it strikes the earth surface.
Friday, January 8, 2016 by collins

Science
Give two reasons why so little is known about organisms from the Precambrian time, even though it was the longest period and early earth's history?
Friday, January 8, 2016 by Danielle

maths
distance around the earth is 4.5x10 ^4 km. whats that in metres?
Wednesday, January 6, 2016 by Anonymous

maths
If the speed of light is 3x10^8m/s and the distance around the earth is 4.5x10^4 km and a plane could travel at half a speed of light, how long would it take for the plane to fly around the earth twice?
Wednesday, January 6, 2016 by Anonymous

Word problem
earth and cement block filling a box weighs 390mlb.the block weigh 2.4times as much as water and earth weighs 1.5times as much as water.water filling the box weighs 2000lb.find the weigh of the cement block.bl? plz help help help!!!! Show work
Wednesday, January 6, 2016 by Collins

physics
It has been suggested that rotating cylinders about 12.5 mi long and 4.88 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth? Answer...
Tuesday, January 5, 2016 by king

Science "check my "answers"
1. Which of the following statements best defines tides? (1 point) when waves get bigger because of an approaching storm the rise and fall of ocean water that occurs about every 12.5 hours the rise of ocean water that occurs 12 times a day a giant wave that can be extremely ...
Tuesday, January 5, 2016 by YRN DJ

Science
1.Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? -a solar eclipse -a lunar eclipse -a total lunar eclipse -a penumbra 2.Which of the following statements about a lunar eclipse is true? -A lunar eclipse can occur when the ...
Monday, January 4, 2016 by YRN DJ

mechanics
please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re...
Friday, January 1, 2016 by incredible

math
Formula for distance to the horizon for a satellite in orbit. d = sqrt(2rh+h^2) d = distance to the horizon h = height above sea level for the observer. r = radius of the earth ---------------------------------- Solve for h. ie. so I can plug in d and r and get a solution for h.
Wednesday, December 30, 2015 by John

Math/Science
Calculate the minimum change in velocity (delta V or ∆V) required for the Space Shuttle to decrease its altitude to 60 miles if it’s orbiting with an apogee of 260 miles and a perigee of 220 miles above the surface of Earth.
Tuesday, December 29, 2015 by Lane

dynamics
(a) A rocket is travelling out of the earth’s atmosphere. During flight it burns fuel at a rate of 80kg/s producing a constant thrust of 500kN which drives the rocket in a vertical trajectory. It has a mass of 3500Kg when it reaches a speed of 1220m/s. At this point in ...
Tuesday, December 29, 2015 by kevin

Physics
The radius of the earth's orbit around the sun (assumed to be circular) is 1.50 X 108 km, and the earth travels around this orbit in 365 days. (a) What is the magnitude of the orbital velocity of the earth, in m/s? (b) What is the radial acceleration of the earth toward ...
Monday, December 28, 2015 by Edge

Science
How can volcanic eruptions change the surface of the earth? by creating large deposits of coal by creating new islands and land by lowering land levels several feet by decreasing the level of the ocean I think its C
Saturday, December 26, 2015 by Courtney

metreology
Wien’s radiation law says that the wavelength of most intense radiation (λmax) emitted by a blackbody is inversely proportional to the absolute temperature (T) of the object. The surface of the Sun radiates as a blackbodyat a temperature ofT=6000 kelvins so that the ...
Tuesday, December 22, 2015 by larry

History
sequence of events of Earth's history for the Mesozoic and Cenozoic eras. I know That the Cenozoic era was first but I cant find anything on google its not working its saying page has been dispaneded :(
Saturday, December 19, 2015 by plz healep

Social Stuies
Which of the following does NOT concern dividing up the earth into smaller sections? A. Parallels B. Meridians C. cardinal directions D. Hemispheres
Friday, December 18, 2015 by AlmostStolen

Science
What would happen to ocean tides on Earth if Earth stopped rotating?
Friday, December 18, 2015 by Josh

Chemistry help
The earth moves round the sun in one year.the average earth-sun distance is 1.5*10^11m given that the mass of the earth is 5.98*10^24kg (a):the angular momentum of the earth??? (b):kinetic energy of the earth motion?? (c):kinetic energu of the earth motion half way along it ...
Friday, December 18, 2015 by Collins

Social sudies
What was the purpose of the Missouri Compromise? A) It was an attempt to annex new territories from Mexico. B) It was an attempt to abolish slavery in the United States. C) It was passed to force South Carolina to secede from the Union. D) It was an attempt to balance ...
Friday, December 18, 2015 by PLease help

history
all I need is sequence of events of Earth's history for the Mesozoic and Cenozoic eras. just facts that I could put up. I believe the Mesozoic era was the fist one with humans in it? (IN ORDER PLEAEE)
Thursday, December 17, 2015 by Help

Physics
A person weighs 600 N on Earth. What is the person's mass?
Thursday, December 17, 2015 by Val

history?
sequence of events of Earth's history for the Mesozoic and Cenozoic eras. I know that the Mesozoic Era is an interval of geological time from about 252 to 66 million years ago. and people also call it the Age of Reptiles, And I know that the Cenozoic Era is the current and...
Thursday, December 17, 2015 by DEEZ GOT HEE

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Homework Help: Science