1. Earth is the prototype ____ planet.
2.-3. The outer layer, or crust, consists primarily of oceanic___ and continental ___
4. Earth's present shape is not a perfect sphere but an___
5. The layer.___ from the mantle. is the transitional boundary that divides the crust of the
6. The power to move the plates is provided by slow___ mantle, a process by which heat escapes from the interior through the upward flow of warmer material and the slow sinking of cooler material.
7.____ is an idea that explains how slow motions within the mantle of Earth move large segments of the crust, resulting in a gradual "drifting" of the continents as well as the formation of mountains and other large-scale geological features.
8. Near the top of the stratosphere is a layer of___ a form of oxygen with three atoms per molecule instead of the usual two.
9.-13. At Earth's surface, the atmosphere consists of 78%__ 21%__ and 1%__ with traces of,___,___
14. The separation of Earth into layers of different densities is an example of___ the process of sorting the major components of a planet by density.
15. Earth's interior has been probed in considerable detail by measuring the transmission of___ through Earth.
17. Some planetesimals were large enough to attract their neighbors gravitationally and thus to grow by the process called___
18.97% of Earth's water is found in___
19. - 20. The lithosphere includes__ and uppermost, rigid____​