The Earth

Below is a free term papers summary of the paper "The Earth." If you sign up, you can be reading the rest of this term papers in under two minutes. Registered users should login to view this term paper.

Term Paper Title	The Earth
# of Words	709
# of Pages (250 words per page double spaced)	2.84

The Earth

Did u know that our planet, Earth wasn’t always thought of as a planet?  Until the sixteenth century when Capernicus figured out that the Earth was another planet, which revolved around the sun, Greek astronomers thought the Earth was the center of the solar system.  Also Earth is the only planet that its name didn’t come from  Greek/Roman mythology.
     When earth was first discovered, astronomers were only able to study it with out spacecraft.  It was not until the twentieth century that we had maps of the entire planet.  Pictures taken of the planet are very important, not only because they aid in weather predictions, but they are also very beautiful.
     The Earth is divided into seven layers: the crust, upper mantle, transition region, lower mantle, D” layer, outer core, and inner core.  “The crust varies considerably in thickness; it is thinner under the oceans, and thicker under the continents”. (Arnett1)  The inner core and crust are solid, and the outer core and mantel layers are plastic or semi-fluid.  Most of Earth’s mass is in its mantle and the rest is in its core.
     Most of the core is made of iron, but there may be lighter elements in it too.  Temperatures at the center of the core can be as high as 7500K, which is hotter than the surface of the sun.
     “Unlike the other rocky planets, Earth’s crust is divided into several separate plates, which float around independently on top of the hot mantle below”. (Arnett1)  This is called the plate tectonics theory.  This is created by two processes.  The first is spreading which occurs when two plates move away form each other and magma gets in, creating a new crust.  The second is subduction, which is the opposite.  When this happens two plates collide and one ends up being destroyed in the mantle.  There are eight major plates: The North American Plate, South American Plate, Antarctic Plate, Eurasian Plate, African Plate, Indian-Australian Plate, Nazca Plate, and Pacific Plate.  Other than these plates are about twenty small plates.
     The surface of the Earth is about 4.5...

This is not the end of the termpaper! Register below to see the complete version of this term paper.

Membership Plans	Credit Card	Check

1 month membership

3 month membership (You Save 50%)

6 month membership (You Save 67%)

Copyright © 2002-2007 Mid Term Papers. All rights reserved. This term papers website is used for research purposes only.
If you have forgotten your username or password, please click here.
If you like to cancel your account, please click here.

1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22