Plate Tectonics

3. Inner layer
4. the remains or impression of a prehistoric plant or animal
7. the rigid outer part of the earth
8. a long high sea wave caused by an earthquake
10. a slab of solid rock
13. moving closer together
14. make a marked change
15. layer between crust and core
17. moving away
18. a long narrow natural elevation or striation
19. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate

1. soft layer of the mantle
2. the bending of rock layers
5. an opening in Earths crust where lava or volcanic ash can escape
6. outermost solid layer
9. a large natural elevation of the earth's surface
10. a supercontinent that incorporated almost all the landmasses on Earth
11. a sudden violent shaking in the ground
12. a long, narrow ditch
13. any of the world's main continuous expanses of land
16. Earth's lithosphere pulls apart to form long, narrow, faulted rift valleys and rift zones