Earth Science

3. Satellite orbiting Earth.
5. all water on or surrounding the Earth's surface.
6. underwater mountain chains.
8. the crust and upper mantle.
11. Outermost layer of the Earth's atmosphere. Sometimes considered as an extra layer.
13. when gas turns a liquid.
14. Twenty- eighth element of the periodic table. Can be found in the core of Earth.
16. a long narrow deep sided depression in the earth's oceanic crust.
19. Seventh element on the periodic table. Dominate gas in the earth's atmosphere.
20. Eighth element on the periodic table. Important gas in the atmosphere.

1. One of the major greenhouse gases in Earth's atmosphere.
2. the point within Earth where faulting begins.
4. separates the crust and mantle.
7. gas that protects Earth from harmful gases.
9. a supercontinent formed by all of the continents that existed millions of years ago.
10. the faulting point directly above the surface.
12. Without this, no life would exist on Earth.
15. a place where lava reaches the surfaces.
17. a sudden release of stored energy created by tectonic forces.
18. an underwater mountain