Plate Tectonics Vocabulary
Across
- 3. a plate boundary where two plates move toward each other.
- 8. the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.
- 9. a plate boundary where two plates move away from each other.
- 10. the name of the single landmass that broke apart 200 million years ago and gave rise to today's continents.
Down
- 1. a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
- 2. the process by which molten material adds new oceanic crust to the ocean floor.
- 4. the hypothesis that the continents slowly move across earth's surface.
- 5. an undersea mountain chain where new ocean floor is produced.
- 6. the process by which ocean floor sinks beneath a deep-ocean trench and back into the mantle.
- 7. a break or crack in Earth's lithosphere along which the rocks move.