plate tectonics

5. the solid, outer layer of the earth that consists of the crust and the upper part of the mantle
7. an underwater chain of mountains.
10. a vent on the earths surface where magma and gases are expelled
12. boundary between two plates that are sliding past each other
14. currents in the mantle from the magma being heated by the core of the earth
15. the supercontinent that existed millions of years ago
16. a theory proposed by Alfred Wegener that explains how large pieces of land called plates move and change shape of the earth.

1. a boundary where two plates are moving apart - hint: create new crust
2. boundary between two colliding plates - keywords: ocean trench
3. the layer of rock that forms earth's outer surface
4. Alfred Wegner's hypothesis that the continents were once a supercontinent
6. creates midocean ridges, earthquakes, and volcanic activity
8. when one tectonic plates dives under another
9. the process by which Earth's crust breaks apart
11. a deep valley that forms on land at a divergent boundary where two plates move apart
13. created by two pieces of continental crust converging