Across
- 4. a tool used to spread water across fields.
- 5. a deep undersea valley where crust sinks towards the mantle.
- 6. a waterfall
- 7. a type of fabric woven from flax plants.
- 8. an undersea chain of mountains that is part of a long system of underwater mountains.
- 9. a device that reflects sound waves off underwater objects and records the echos.
Down
- 1. the area near the mouth of a river where the water deposits fine soil.
- 2. the process by which crust sinks back into the mantle at a colliding plate boundary.
- 3. good for growing crops.
- 4. the process by which molten material adds new crust below Earths bodies of water.