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6. The water that falls on the ground as rain, snow, sleet, hail or mist.
7. A long, narrow band of volcanoes surrounding the Pacific Ocean.
8. To circle around something.
9. The average weather in an area over a long period of time.
12. A star which in fact is the source of all energy on Earth.
14. The process in which Earth’s surfaces are worn away by natural forces.
16. This makes up three percent of the water on Earth.
18. One of two days each year when the sun is directly overhead at the Equator.
19. A lowland area between two higher sides such as mountains or hills.
21. One layer of this is the air we breathe.
22. The process by which weathered bits of rock are moved elsewhere by water, wind or ice.
24. A large, unbroken mass of land.
25. Melted rock in the Earth.

1. The subsystem that consists of the Earth’s water.
2. A large body of ice that moves slowly across land.
3. We live on this layer of the Earth.
4. One of two days a year when the sun reaches its northernmost or southernmost point.
5. A long, narrow area that extends into a river, a lake or an ocean.
10. An event in which the ground shakes or trembles, brought about by the collision of tectonic plates.
11. This exists in the three states of matter: solid, liquid and gas.
13. The longest underwater mountain range which is longer than any mountain range on land.
15. A complete trip of the Earth around the sun.
17. A giant ocean wave caused by volcanic eruptions or the movement of the earth under the ocean.
20. A place where two tectonic plates grind against each other.
23. A thick, hot layer of dense rock that surrounds the outer core.
26. An imaginary line that runs through the Earth’s center from the North Pole to the South Pole.