Plate Tectonics
Across
- 3. Long crack in the surface of the Earth. Where earthquakes usually occur. San Andreas Fault.
- 6. When two tectonic plates move toards each other and collide. Equal density.
- 7. 1st theory describing the history of Earth's surface. States that the continents were once connected and have drifted apart.
- 9. When 2 plates slide past each other. Fault lines
- 10. Tectonic plates that are at the bottom of the ocean.
- 14. South America matches up with this continent.
- 15. scrapes across rocks where a glacier once was.
- 16. Parallel pattern of rock material found at indetical locations across the Mid-Atlantic Ridge. Reveals rock of the same geological age.
- 18. huge pieces of lithosphere that slowly move on the asthenosphere. Consists of crusts and uppermost part of mantle.
- 19. The scietist who is generally credited with the continental drift theory.
- 20. When two plates move away from each other. Continental = rift valley. Ocean = mid ocean ridge.
Down
- 1. When a denser plate is pushed down and beneath a less dense plate. Occurs at a convergent boundary. Creates volcanoes and trenches.
- 2. 2nd theory describing the history of Earth's surface. States that the lithosphere is divided into plates that are moving on top of the asthenosphere.
- 4. rock formations, rivers, and lakes appear to match up on different continents due to this piece of evidence.
- 5. seafloor mountain system formed by divergent boundaries
- 8. The amount of matter in a given space of volume. Oceanic crust is thinner and denser than continental crust.
- 11. Tectonic plates that lie under surface land masses.
- 12. super continent that had most of the land masses before it seperated.
- 13. evidence of dead plants and animals
- 17. Circular movement of fluids caused by the rising of hotter, less dense fluid and the falling of cooler, denser fluid.