Across
- 4. A plate boundary where two plates move toward each other.
- 5. Stress that stretches rock so that it becomes thinner in the middle.
- 9. A plate boundary where two plates move away from each other.
- 10. Stress that squeezes rock until it folds or breaks.
- 11. Stress that pushes a mass of rock in opposite directions.
- 12. The name of the single landmass that broke apart 200 million years ago, and gave rise to today's continents.
- 13. Continental-Drift The hypothesis that continents slowly move across Earth's surface.
Down
- 1. Elongate depression of the Earth's surface.
- 2. A series of extremely long waves caused by large and sudden displacement of the ocean, usually the result of an earthquake below or near the ocean floor.
- 3. A landform that rises at least 1,000 feet (300 meters) or more above its surrounding area.
- 5. Long, narrow depression on the seafloor that forms at the boundary of tectonic plates where one plate is pushed, or subducts, beneath another.
- 6. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
- 7. Boundary A plate boundary where two plates move past each other in opposite directions.
- 8. A major belt of volcanoes that rims the Pacific Ocean.