Across
- 3. the ability to do work.
- 5. forces such as ice, rain, wind, and changing temperatures wear down, or destroy, landmasses
- 6. has three main parts; a metal core, a solid middle layer, and a rocky outer layer.
- 8. the relatively thin envelope of gases that forms earth's outermost layer.
Down
- 1. forces that construct, or build up, mountains.
- 2. a group of parts that work together as a whole.
- 4. contains all of earth's waters.
- 7. the part of the earth that contains living organisms.