Across
- 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
Down
- 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