Across
- 4. resistance to flow
- 6. new crust is formed at ________ boundaries
- 9. phenomenon responsible for shifting tectonic plates
- 11. mountains form where tectonic plates ______
- 12. thickest layer of Earth
- 13. one layer of crust folds under another
- 14. oceanic plates are _____ than continental plates
Down
- 1. Alfred Wegener's hypothesis
- 2. Earth's outer layer
- 3. crust is destroyed at ______ boundaries
- 5. water covers ___% of Earth's surface
- 7. molten rock deep below the Earth's surface
- 8. tectonic plates move a few _____ per year
- 10. Earth is mostly composed of ....