Friday
May 27, 2016

Homework Help: Science: Earth

Recent Homework Questions About Earth

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

math
the scientific notatio of velocity of light velocity of sound distance between the sun and earth
Thursday, December 17, 2015 by amulya

Science
istance of a planet from sun is four times the distance of the planet frpm earth.How many years will the planet take to complete one revolution of sun?
Thursday, December 17, 2015 by Nikhil

math
An object that weighs about 2.1 pounds on the moon weighed 12.56 pounds on Earth. About how much would an astronaut who weighs 174 pounds on Earth weigh on the moon?
Thursday, December 17, 2015 by sharday

Social Studies
According to Aborigine spiritual beliefs, the Earth is a. a place of unending suffering and pain.*** b. a source of wealth to conquer in the name of one's ancestors. c. an ancient gift of the gods. d. a place where humans were banished from the gods.
Wednesday, December 16, 2015 by Kaai97

Social Studies
According to Aborigine spiritual beliefs, the Earth is (1 point) a. a place of unending suffering and pain.*** b. a source of wealth to conquer in the name of one's ancestors. c. an ancient gift of the gods. d. a place where humans were banished from the gods.
Wednesday, December 16, 2015 by Kaai97

Social Studies
Which of the fallowing is not true about Aborigine culture? a. It is the oldest surviving culture on Earth*** b. Tradition Aborigine societies found agricultural settlements c. Aborigine do not believe that land belongs to humans d. Aborigine groups are spread across the ...
Wednesday, December 16, 2015 by Kaai97

science help PLS
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, December 16, 2015 by Oscar

Physics
Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 44 kg student to accelerate downward at 9.8 m/s2, determine the upward accelera- tion of the Earth during the student’s fall. Answer in units of m/s2.
Wednesday, December 16, 2015 by Lily

science help PLS
Which of the following correctly describes a way in which Earth’s atmosphere interacts with the geosphere? It contains gases that living organisms breathe. It contains gases that trap incoming solar radiation. It provides a medium for cycles that provide nutrients to ...
Tuesday, December 15, 2015 by Oscar

Science
What can scientists learn from the rate at which radioactive elements decay? A. a rock's absolute age* B. the relative age of rock layers C. where one soil horizon ends and the next begins D. the difference between molds and casts. The relative age of a rock is A, its age ...
Tuesday, December 15, 2015 by Brittany P.

Science HELP PLZ
1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1 point) A lunar eclipse can...
Monday, December 14, 2015 by Layla

Physics
An astronaut on board a spacecraft is in orbit around the earth in uniform circular motion. Is her velocity speed and acceleration constant?
Monday, December 14, 2015 by Haylee

Physis
The question: You are standing on a large sheet of frictionless ice and holding a large rock. In order to get off the ice, you throw the rock so it has velocity 11.9 m/s relative to the earth at an angle of 36.8∘ above the horizontal. If your mass is 70.5 kg and the rock...
Sunday, December 13, 2015 by RK

physics
How much would the time keeping of a pendulum clock be affected by taking it to the moon? Gravity is 1.6m/s ^2, compared with 10m/s ^2 on the earth.
Saturday, December 12, 2015 by Peter

Adv. Func./Science Question
Hi, I have this question that I will be tested on but my teacher didn't teach us how to do it so I am confused on how to even start. Please explain on how to start the question...thank you How bright a star appears can depend on how much light the star actually emits and ...
Saturday, December 12, 2015 by Vivian

Ap physics 1
The mass of a star in a galaxy far, far away, is 3.12 × 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 2.46 × 108 km. Treating this planet and star as particles,with each mass ...
Friday, December 11, 2015 by Jonathan

science + check over
please check my answers + help me improve them. * 1.) explain why earth & other planets were not solid when they formed during the beginning of the precambrian, approximately 4,600 million years ago + what was this particular time period called & why is this time period not ...
Friday, December 11, 2015 by abx +

Language Arts
1. Which sentence contains an opinion? (1 point) Thomas Jefferson supported American independence from Great Britain. He was a lawyer in his home state of Virginia. Jefferson authored the Declaration of Independence, the most important document in history.•• He ...
Friday, December 11, 2015 by Alex

Physics
The average speed of an orbiting space shuttle is 19700 mi/h. The shuttle is orbiting about 125 mi above the Earth’s surface. Assume the Earth’s radius is 3963 mi. How long does it take to circle the earth? Answer in units of h.
Thursday, December 10, 2015 by Lily

Science
1. how does earth's rotation cause day and night? (1pt) A.)As the earth rotates toward the east the sun appears to rise in the east and set in the west. B.)As earth rotates towards the east, the sun appears to rise in the east and set in the west C.)Earth rotation does not...
Thursday, December 10, 2015 by YRN DJ

Physics
2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. Show your work. Answer: g= GM/r² G= 6.67 * 10^-11 Nm²/kg² ME= 5.98 * 10^24 kg RE=...
Thursday, December 10, 2015 by Danielle

Earth Science
Compared with dull and rough rock surfaces, shiny and smooth rock surfaces are more likely to cause sunlight to be… my answer is reflected. Am i right?
Wednesday, December 9, 2015 by KaiCaster

Earth Science
In recent years, scientists have been concerned about decrease in the ozone content of earth’s upper atmosphere. What is the principle threat to humans if this decrease in ozone continues? My answer is, Decreasing precipitation leading to crop failure and possible human ...
Wednesday, December 9, 2015 by KaiCaster

Earth science
What prevents life from developing on land before Earth’s atmosphere contained a significant portion of oxygen? (1) All land locations were too hot for life to exist. (2) All terrestrial environments were too cold for life to even exist. (3) All forms of life require ...
Wednesday, December 9, 2015 by KaiCaster

Earth Science
If atmospheric pressure is 30.40 inches of mercury, what is the air pressure in millibars? (1)1016 mb (2)1028.3 mb (3)1029 mb (4)1029.5 mb I think that the answer is either 2 or 4, could you check my answer?
Wednesday, December 9, 2015 by KaiCaster

Science
1.)TRUE OR FALSE: Scientific investigations involve testable questions. * True False 2.)Which of the following would not be a reliable place to find research for a scientific investigation? * science journals experts wikipedia textbooks 3.)Why should a scientist reapeat an ...
Wednesday, December 9, 2015 by Jasmine

jay kay public
Consider a planet in space whose mass is twice that of earth and radius is thrice that of earth what will be the weight of a body on this planet if its weight on the earth is 900N ??
Tuesday, December 8, 2015 by adi

Physical science
the space shuttle typically orbits 400 km above the earth's surface.the earth hass a mass of 5.98*10 to the 24 squared kg and a raduis of 6,380 km.A)how much would a 2000 kg part form the space station weight when it has been lifted to that orbit in the shuttle's cargo...
Monday, December 7, 2015 by Chad

physics
On planet X, an object weighs 18.1 N. On planet B where the magnitude of the free-fall acceleration is 1.28 g (where g = 9.8 m/s 2 is the gravitational acceleration on Earth), the object weighs 37.9 N. The acceleration of gravity is 9.8 m/s 2 . What is the mass of the object ...
Monday, December 7, 2015 by zach

Physics Help
A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If r≫a, the difference in the gravitational force exerted on the two masses by the Earth is ...
Monday, December 7, 2015 by jacob

Science
1.)Why is Earth’s temperature just right for life? (1 point) A.)Earth’s core is hot enough to heat Earth’s surface. B.)Earth’s magnetic field creates suitable temperatures on Earth’s surface. C.)Earth’s crust is warmed by heat from the sun. D.)...
Monday, December 7, 2015 by YRN DJ

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?
Sunday, December 6, 2015 by Marissa

Physics
A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m . If the star initially rotates at the same rate as our Sun, ...
Sunday, December 6, 2015 by Viert

Earth science
According to the suplimentary demands the price you pay for a product is determine both by its availability and by consumer demand for the product. On the basis of the principle, which mineral do you think have a higher value, iron containing mineral or feldspars? Some one ...
Sunday, December 6, 2015 by Kayla

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?
Sunday, December 6, 2015 by Marissa

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?
Sunday, December 6, 2015 by Marissa

Chemistry
the effective incoming solar radiation per unit area on earth is 342 W/M^2. of this radiation, 6.7 W/m^2 is absorbed by CO2 at 14993 nm in the atmosphere. how many photons at this wavelength are absorbed per second in 1 m^2 by CO2?
Saturday, December 5, 2015 by Anonymous

english
how would you describe some who is crazy to jump from outer space to earth
Saturday, December 5, 2015 by Adam

Chemistry (Gas)
A cylinder is filled with 120L of air at 101 kPa and 20*C. How long could the cylinder be used "just underwater" on earth assuming 2L is used every 5 seconds. I don't understand what the pressure and temperature would be "just underwater." Is it assumed...
Saturday, December 5, 2015 by A

physics
The weight of an object on earth is 20 newton if the object put 6400km above from the earth so what was the weight of the object if the radius of earth is 6400 km
Saturday, December 5, 2015 by naina

Science
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...
Thursday, December 3, 2015 by Cami

Science
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...
Thursday, December 3, 2015 by Cami

SCIENCE ...Check answers PLZ
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...
Thursday, December 3, 2015 by Cami

astronomy
A possible trajectory for sending a spacecraft to Mars is an elliptical orbit with Earth at its perihelion and Mars at its aphelion. The craft would be launched out of low-Earth orbit by a quick burst of rockets into solar orbit, and would then "coast'' until ...
Thursday, December 3, 2015 by johan

SCIENCE
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...
Thursday, December 3, 2015 by Cami

Earth Science
Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral? sulfur ...
Thursday, December 3, 2015 by Anonymous

Earth Science
Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral? sulfur ...
Thursday, December 3, 2015 by Anonymous

Physics
You jump from a height of 1.0m from the surface of the Earth. The Earth will actually move a bit as you land. a.) Explain Why b.) Estimate the distance the Earth moves, listing any assumptions you make
Wednesday, December 2, 2015 by Jack

Physics
NASA lost contact with Pioneer 10 on January 22, 2003. How far in meters was it from the sun on that date? Pioneer 10 was traveling at 12.24 km/s relative to the sun. Calculate the position of Pioneer 10 as of January 2009 relative to the sun. Pioneer is headed toward the star...
Wednesday, December 2, 2015 by Madison

Physics
When you drop a 0.27-kg apple, Earth exerts a force on it that accelerates it at 9.8 m/s2 toward Earth's surface. According to Newton's third law, the apple must exert an equal and opposite reaction force on Earth. If the mass of Earth is 5.98 1024 kg, what would be ...
Wednesday, December 2, 2015 by Anonymous

physics
A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If r≫a, the difference in the gravitational force exerted on the two masses by the Earth is ...
Tuesday, December 1, 2015 by brooklyn

Chemistry
Assume earth travels in UCM in orbit around the sun R=1.50 x 10 to the 11th power m T-365.25
Tuesday, December 1, 2015 by Anonymous

Science
Suppose the moon rotated on its axis just as quickly as earth. Would you still see the same side of the moon from earth? Please help!
Monday, November 30, 2015 by Amanda

Algebra
Sabrina is building a rectangular raised flower bed. The boards on the two shorter sides are 6 inches thick, and the boards on the two longer sides are 4 inches thick. Sabrina wants the outer length of the bed four times it's height and the outer width to be 2 times it'...
Sunday, November 29, 2015 by Help me

Science
How did the brightness or intensity of the light change as the degree of tilt increased? Which degree of tilt produced light similar to what North America experiences in the summer? What would be the effect on the seasons and the northern and southern hemispheres if earth were...
Saturday, November 28, 2015 by Ito

Social Studies, Ms. Sue, Reed, Check My Work
1. Geographers use the five themes of geography to (2 points) study world history. organize information. study world music. measure locations.• 2. People invented flat maps because globes cannot show (2 points) names of continents. shapes of continents. enough detail.&#...
Tuesday, November 24, 2015 by Sam

physics
Two satellite are monitored as they orbite the earth,satellites Y is foure times as far from the earth's centere as is satellite X. if the period of revolution of satellite X is T. What is the period of revolution of Y?
Monday, November 23, 2015 by debiru

Science
What would be a good way using the terms mass and weight to explain how to measure gold so it's the same on earth and on the moon?
Monday, November 23, 2015 by Patrick

Science
Why would the weight of gold be less on earths moon than it would be on earth?
Monday, November 23, 2015 by Patrick

science
As the moon revolves around the Earth, it also rotates on its axis. Why is it that the the same side of the moon is always visible from Earth?
Sunday, November 22, 2015 by Lakshmi

Physics
The earth spins on its axis once a day and orbits the sun once a year (365 1/2 days). Determine the average angular velocity (in rad/s) of the earth as it (a)spins on its axis and (b) orbits the sun. In each case, take the positive direction for the angular displacement to be ...
Saturday, November 21, 2015 by Jose Luis

Phyics
The foci of the elliptical path for an Earth satellite are __________. A) one at Earth's center and the other elsewhere B) one atop the other at Earth's center C) both inside Earth D) both outside Earth
Saturday, November 21, 2015 by sarah

Physics
Szymon and Chris fly their balloon around the earth in 80 days. Taking the radius of the earth to be 6400 km, calculate their average speed in m/s. I did answered all the homework questions but I didn't know how to do this one?
Saturday, November 21, 2015 by Andrew

math
A low land, 48m long and 31.5 m broad is raised to 6.5 dm. For this, earth is removed from a cuboidal hole, 27 m long and 18.2 m broad, dug by the side of the land. The depth of the hole will be? A man rows 12 km in 5 hrs against the stream, the speed of current being 4 kmph. ...
Friday, November 20, 2015 by adam

Check My Work Social Studies, Ms. Sue, Reed, Please
1. Geographers use the five themes of geography to (2 points) study world history. organize information. study world music. measure locations.• 2. People invented flat maps because globes cannot show (2 points) names of continents. shapes of continents.• enough ...
Friday, November 20, 2015 by Sam

Physics [Help, need answer in 10 min]
During a solar eclipse, the moon (of mass 7.36 × 1022 kg), Earth (of mass 5.98 × 1024 kg), and Sun (of mass 1.99 × 1030 kg) lie on the same line, with the moon between Earth and the Sun. What gravitational force is exerted on the moon by the Sun? The ...
Thursday, November 19, 2015 by James

SCIENCE
1. Which of the following is an example of an environmental pressure? (1 point) the air pressure in the atmosphere a lake that is gradually running out of water a fight between two members of the same species breeding between two members of the same species 2. Which of the ...
Thursday, November 19, 2015 by Anonymous

physics
What would be the orbital speed and period of a satellite in orbit 1.50 ✕ 10^8 m above the Earth?
Wednesday, November 18, 2015 by Jackson

English
What does Asimov predict will happen to earth in billions of years? a. it will be burned up by the sun b. its population will increase c. it will shrink slightly in size d. it will change position in the galaxy*****
Wednesday, November 18, 2015 by Ms. Sue?! please help

SS plz help me plzzzzzzz
What are the two major forces that reshape earth? Describe how itworks. plz plz plz help me there are no answer choices hope u can still help
Wednesday, November 18, 2015 by #AriannaGirl :)

English
Please check my answers! This story was pretty confusing to me. 1. The purpose of the anecdotes in "The Last Judgment" about each person Kugler has known serve most to A. generate sympathy for Kugler B. Add characters to the story C. Help the judges make their ...
Wednesday, November 18, 2015 by Anonymous

SS PLZ HELP ME ASAP
What are the two major forces that shape and reshape earth? Describe how each one works. plz plz plz help me there are no answer choices hope u can still help
Wednesday, November 18, 2015 by #AriannaGirl :)

Science
1) Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really considered a part of Earth’s ...
Tuesday, November 17, 2015 by Anonymous

SCIENCE check answers please :)
1) Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really considered a part of Earth’s ...
Tuesday, November 17, 2015 by Cami

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Homework Help: Science