Across
- 6. the denser a plate sinks
- 7. happens when two plates separate
- 10. what earth's surface is made out of
- 12. in the middle of the ocean
- 14. outermost layer
- 15. direction going the opposite way
Down
- 1. two plates collide
- 2. reverses magnetic direction
- 3. the spreading of a floor
- 4. makes compass needles point north
- 5. moving pieces of land
- 8. moves the lithosphere in the opposite direction
- 9. The first continent
- 11. when plates slide past each other
- 13. differences in temperature and density