Across
- 6. Scientists associated with studying planet Earth
- 7. deep underwater canyons in the ocean
- 8. Earth’s Rocky outer layer
Down
- 1. Broken up sections of a lithosphere
- 2. Process which the ocean floor sinks beneath a deep ocean trench
- 3. device that bounces sound waves off of water objects
- 4. The 7 great land masses on Earth
- 5. Remains of an ancient organism