plate tectonics

1. the layer of rock that forms earth's outer surface
4. created by two pieces of continental crust converging
6. a boundary where two plates are moving apart - hint: create new crust
7. the supercontinent that existed millions of years ago
9. the solid, outer layer of the earth that consists of the crust and the upper part of the mantle
12. where two or more plates meet
14. the process by which Earth's crust breaks apart
15. a vent on the earths surface where magma and gases are expelled
16. an underwater chain of mountains.
17. boundary between two plates that are sliding past each other
18. the man who came up with the theory of plate tectonics
19. creates midocean ridges, earthquakes, and volcanic activity

1. boundary between two colliding plates - keywords: ocean trench
2. when one tectonic plates dives under another
3. layer that the tectonic plates slide on, also before the crust
5. Alfred Wegner's hypothesis that the continents were once a supercontinent
8. a deep valley that forms on land at a divergent boundary where two plates move apart
10. a theory proposed by Alfred Wegener that explains how large pieces of land called plates move and change shape of the earth.
11. the deepest layer of the earth with an inner and outer version
13. currents in the mantle from the magma being heated by the core of the earth