Across
- 7. elongated depressions in the ocean
- 9. sudden events that led to a mass extinction
- 11. Extinction over a longer time
- 12. ringed prices of the lithosphere
- 14. fractures or zones of weakness in the Earth's crust
- 15. an opening in the crust which molten lava comes out
- 18. semi-fliud area of the mantle
- 19. forms after weathering and erosion
- 20. Instruments used to measure and record seismic waves
Down
- 1. crust and upper part of mantle
- 2. A group of one species living in one area
- 3. Hot material rises, cooler materials sink, drives plate tectonics
- 4. plates moving away from one another
- 5. result of high temp and pressure changing another rock
- 6. between mantle and the outer core
- 7. plates sliding on top of one another
- 8. when plates collide
- 10. plates going to one another making mountains
- 13. plates pull apart and magma rises
- 16. Rock when magma or lava cools
- 17. when all plates where together