Plate Tectonics

8. A plate boundary where two plates move toward each other.
9. What is the name of the scientists that came up with the theory of the continental drift/pangaea?
10. The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents.
11. The process by which ocean floor sinks beneath a deep-ocean trench and back into the mantle.
12. A plate boundary where two plates move away from each other.

1. The process by which molten material adds new oceanic crust to the ocean floor.
2. A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
3. tectonics The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.
4. a break or crack in Earth's lithosphere along which the rocks move.
5. A undersea mountain chain where new ocean floor is produced.
6. A plate boundary where two plates move past each other in opposite directions.
7. The hypothesis that the continents slowly move across Earth's surface.