Across
- 1. boundary - A plate boundary where two plates come together
- 3. - The name of the single landmass that began to break apart 200 millions years ago and gave rise to today’s continents.
- 7. boundary - A plate boundary where two plates move away from each other
- 9. boundary - A plate boundary where two plates move past each other in opposite directions
- 10. tectonics - The theory that pieces of Earth's lithosphere are in constant motion, driven by conventional currents in the mantle.
- 11. spreading - The process by which molten material adds new oceanic crust to the ocean floor
- 12. ridge - An undersea mountain chain where new ocean floor is produced; a divergent plate boundary under the ocean
Down
- 1. drift - The hypothesis that the continents slowly move across Earth’s surface.
- 2. trench - A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantel
- 4. - The preserved remains or traces of an organism that lived in the past.
- 5. - A break or crack in Earth's lithosphere along which the rocks move
- 6. - The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantel at a convergent plate boundary
- 8. boundary - A valley that forms where plates spread apart at spreading boundaries
- 10. - A section of lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust