vocade

3. a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system.
6. the study of the shape and features of the land's surface, including its ups and downs
9. solid, liquid, and gas
11. heat-driven cycles that form in the air and ocean
13. imaginary line through the center of the Earth
14. the movement of energy from one place or object to another
15. living things within an ecosystem
17. the process of changing energy from one form to another

1. energy can neither be created nor destroyed - only converted from one form of energy to another
2. A hurricane is a type of storm called a tropical cyclone, which forms over tropical or subtropical waters.
4. one complete turn of the Earth.
5. the action or state of making or being made impure by polluting or poisoning.
7. a diagram that shows the feeding relationships between species in an ecosystem.
8. one complete orbit around the sun
10. a storm that produces lightning and thunder and is often accompanied by heavy rain and strong winds
12. non-living parts of an ecosystem
16. path a planet follows around the sun. It is oval shaped