Across
- 4. Name given to a supercontinent that began to break apart approximately 290 million years ago
- 7. boundary: The boundary between two plates that move away from each other
- 10. drift: The movement of Earth’s continents over time
- 11. spreading: The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
Down
- 1. ridge: Long, narrow mountain range on the ocean floor; formed by magma at divergent plate boundaries
- 2. boundary: The boundary between two plates that move toward each other
- 3. reversal: An event that causes a magnetic field to reverse directions
- 5. The process that occurs when one tectonic plate moves under another tectonic plate
- 6. boundary: The boundary between two plates that slide past each other
- 8. tectonics: Theory that Earth’s surface is broken into large, rigid pieces that move with respect to each other
- 9. The circulation of particles within a material caused by differences