1. What are the two sources of melting at convergent plate boundaries? 2. Why are there so many volcanoes around the Pacific Ocean basin?
3. What causes melting at divergent plate boundaries?

1. when the temperature rises and if water is added, which lowers the melting point.

2. Most of the Earth's volcanoes are located around the Pacific Ring of Fire because that the location of most of the Earth's subduction zones.

3. At divergent plate boundaries hot mantle rock rises into the space where the plates are moving apart. ... The rock is under lower pressure; this lowers the melting temperature of the rock and so it melts.

Explanation:

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its i think c because its the lowering cloud