Across
- 4. A stream or river that runs into a larger river
- 7. A group of parts that work together as a whole
- 8. Contains all earth's land and rocky surfaces
- 10. Dark, fined-grained rock
- 11. A loop like bend in the course of a river
- 12. Underground water
- 14. Light, coarse grained rock
Down
- 1. A deposit that hangs from the ceiling of a cave like an icicle
- 2. The relatively thin layer of gases that forms earth's outermost layer
- 3. Cone shaped things that come up from cave floors
- 5. The crust is a layer of rock that forms earth's outer skin
- 6. Contains all of earth's living things
- 8. A large groove or channel in the soil that carries runoff
- 9. Contains all of earth's water
- 13. The ability to do work