Earth and space basics

3. The regular rise and fall of the ocean's surface influenced by the moon's gravity pulling on earth
7. a force that exists between any two objects that have mass and that pulls the objects together
8. layer protects Earth from ultraviolet rays
11. A resource that can be replaced within a reasonable amount of time
12. innermost layer of the earth
14. largest and second outermost layer of the earth
15. a localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground
18. A plate boundary where two plates move toward each other.
19. A plate boundary where two plates move past each other in opposite directions.
20. A tropical storm that has winds of about 119 kilometers per hour or higher.

1. A plate boundary where two plates move away from each other.
2. A large cloud of dust and gas in space. (Some are regions where new stars are beginning to form.)
4. layer of water that makes up ¾ Earth's surface
5. gaseous region that surrounds the earth
6. The horizontal movement of air from an area of high pressure to an area of lower pressure
9. A resource that once used, cannot be replaced in a reasonable amount of time
10. the outermost shell of a terrestrial planet
13. second innermost layer of the earth
16. an imaginary line through the center of a body about which the body rotates.
17. A measure of how hot or cold something is.