plate tectonic

1. when 2 plates are moving towards each other
5. the chemistry of the earths crust
7. a rigid layer of the earths crust that is believed to drift slowly
8. a specialist of the history of the earth recorded in rocks
12. came up with the theory of continental drift
13. molten rock in the earths crust
16. transfer of heat caused by molecular motion of liquid or heat
17. the movement or study of the movement of the earths crust
19. movement of one tectonic plate under another
20. a geologist who uses physical principles to study the properties of the earth

2. when 2 plates are rubbing up against each other
3. lower layer of the crust
4. a large gap made from divergent plates
6. happens when plates scrape together
9. a fissure in the earths crust through which gasses explode
10. when 2 plates are moving away from each other
11. of or relating to of characteristics of the crust of the moon or the earth
14. super continent
15. the branch of geology studying the folding and faulting of the earths crust
18. occurs from convergent plates