Across
- 3. the thin, least dense layer of the earth
- 5. When plates separate, they ___.
- 6. When plates collide, they ___.
- 8. The last name of the scientist who proved continental drift
- 9. When plates slide past each other, they ___.
Down
- 1. The biggest layer of the earth
- 2. When a plate slides under another, ___happens
- 4. The last name of the scientist who theorized continental drift
- 6. Movement in the biggest layer
- 7. Underwater valley made by plates spreading apart