plate tectonics

2. boundary between two plates that are sliding past each other
7. the solid, outer layer of the earth that consists of the crust and the upper part of the mantle
9. Alfred Wegner's hypothesis that the continents were once a supercontinent
12. an underwater chain of mountains.
14. created by two pieces of continental crust converging

1. boundary between two colliding plates - keywords: ocean trench
3. a deep valley that forms on land at a divergent boundary where two plates move apart
4. creates midocean ridges, earthquakes, and volcanic activity
5. a vent on the earths surface where magma and gases are expelled
6. a theory proposed by Alfred Wegener that explains how large pieces of land called plates move and change shape of the earth.
8. the supercontinent that existed millions of years ago
10. a boundary where two plates are moving apart - hint: create new crust
11. when one tectonic plates dives under another
13. the process by which Earth's crust breaks apart