Across
- 4. A deep depression in the ocean floor created by a subduction zone.
- 7. Boundary where two tectonic plates move away from each other.
- 9. An underwater mountain range created by seafloor spreading.
- 10. Boundary where two plates slide past each other horizontally.
- 11. The process of one plate sinking beneath another into the mantle.
- 12. The ancient supercontinent that began to break apart millions of years ago.
Down
- 1. A fracture or zone of fractures between two blocks of rock.
- 2. Boundary where two tectonic plates collide or move toward each other.
- 3. A vent in the Earth's crust through which lava, steam, and ashes are expelled.
- 5. A deep valley that forms where plates slide apart on land.
- 6. The rigid outer layer of the Earth, consisting of the crust and upper mantle.
- 8. Sudden shaking of the ground caused by tectonic plate movement.