Across
- 1. one of the things needed for soil
- 3. where the plats move apart
- 7. a string of volcanos and earthquakes around the edge of the Pacific Ocean
- 8. the second layer of the earth
- 10. two plays come together
- 12. the fourth layer of the earth
- 13. Flat plains between mountains
- 14. the outer layer of the earth
- 15. weathering of a natural material
Down
- 2. the name of the man who purposed the theory that the earth was always in motion
- 4. who made a more complete version theory known as plate tectonics
- 5. low precipitation, temperature extreme variations from high to low
- 6. rain,snow,hail
- 9. two plates slide past each other
- 11. the third layer of the earth
- 16. something needed for soil