Across
- 4. type of melting the occurs when pressure drops
- 6. a long belt of volcanoes that circles much of the Pacific Ocean
- 7. Earth's most active volcano
- 8. the _______ content of rock lowers the rock's melting temperature
- 9. boundaries where plates are pushed down into the mantle
Down
- 1. small volcanic region that is a result of a mantle plume
- 2. volcano in Tanzania that has formed near the rift valley
- 3. volcanic activity that occurs within a plate
- 4. boundaries where plates pull apart
- 5. forms in the crust and upper mantle when solid rock partially melts