3.+Earth-+EXAMPLE+PAGE

= Earth = = = = Earth, the planet we live on, is the third planet from the Sun. The Earth's atmosphere is made of 77% nitrogen and 21% oxygen with traces of water and carbon dioxide. The surface of Earth is made up mostly of water, and it is the only planet on which water can exist in liquid form on the surface! =

= Click [|here] to visit the National Geographic page for Earth statistics! =

= Watch this video to investigate why we have seasons! = = media type="youtube" key="DuiQvPLWziQ" height="390" width="480" =

Earth has several layers...


 * 1) Crust
 * 2) Upper mantle
 * 3) Transition region
 * 4) Lower mantle- made of silicon, magnesium, and oxygen
 * 5) D'' layer
 * 6) Outer core
 * 7) Inner core

Click [|HERE] to visit the NASA website and watch PLANET SKITS.