Across
- 4. the circulation of material caused by difference in temperature or density
- 5. The process that recycles the crust of the spreading ocean floor back inside the earth
- 6. forms where two plates separate
- 7. The mountain ranges in the middle of the oceans
Down
- 1. forms where two plates slide past each other
- 2. forms where two plates collide
- 3. New oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge