Across
- 2. outermost layer of the planet
- 4. contains most of earth's mass
- 6. remains of prehistoric organisms
- 8. tall mountain with a lot of pressure that shoots out lava
- 9. hot fluid or semifluid under the earth's crust
- 11. two plates move toward one another then collide
- 12. formed by solidification and deposition of sediments
- 15. violent shaking of the ground
- 16. long and high sea waves caused by earthquakes
- 17. scientist had the theory of continental drift
- 20. made of iron with small amount of iron
Down
- 1. a line on a rock surface
- 3. two plates slide against each other
- 5. two plates moving away from one another
- 7. piece of crust that floats in the mantle
- 10. places where the seafloor spreading takes place
- 13. hot molten rock erupted from a volcano
- 14. formed by cooling and solidification of magma
- 18. technical name for crust and mantle
- 19. formed new rocks caused by extreme pressure