Across
- 2. The theory that Earth’s surface is broken into large, rigid pieces that move with respect to each other.
- 4. Magma that erupts onto Earth's surface.
- 6. Wegener’s hypothesis that all continents were once connected in a single large landmass that broke apart about 200 million years ago and drifted slowly to their current positions.
- 7. The name given to a supercontinent that began to break apart approximately 200 million years ago.
- 8. The long, narrow mountain range on the ocean floor; formed by magma at divergent plate boundaries.
Down
- 1. The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge.
- 3. Molten rock stored below Earth's surface.
- 5. A deep, underwater trough created by one plate subducting under another plate at a convergent plate boundary.