Across
- 3. A sudden shake of the ground because of Earth's crust movement.
- 5. A sunken landform.
- 6. Huge crack down the Earth's surface.
- 8. Underwater mountains formed when tectonic plates pull apart making new magma.
- 9. Cracks in the ocean floor where heated water escapes.
- 11. Powerful, huge waves created by an underwater earthquake.
- 12. One tectonic plate goes under another, sinking to the Mantle.
Down
- 1. A zone round the ocean where earthquakes and volcanoes happen frequently.
- 2. Volcanic islands formed when two ocean plates converge.
- 4. A lowland between mountains where tectonic plates are pulled apart.
- 7. Mountains formed by tectonic plates colliding.
- 10. A depression in the ocean floor