Plate Tectonics

2. a fissure in the earth's crust through which gases erupt
6. crash together with violent impact
7. reduce or cause to be reduced from a solid to a liquid state
9. subject to or caused by an earth vibration
11. a specialist in the history of the Earth recorded in rocks
12. one of the large landmasses of the earth
13. a crack in the earth's crust
14. the chemistry of the earth's crust
16. a geological process where one edge of a crustal plate is forced sideways and downward
19. molten rock in the earth's crust

1. the sudden occurrence of a violent discharge
2. igneous rock produced by eruption and solidified on or near the earth's surface
3. a branch of geology studying the folding and faulting of the earth's crust
4. a grouping of a number of similar things
5. incapable of or resistant to bending
8. relating to based on geology
10. having undergone transformation by pressure, heat, etc.
15. the longest unit of geological time
17. relating to or characteristic of the crust of the earth or moon
18. rock that in its molten form issues from volcanoes