Answer the following question given this paragraph: 

Composite volcanoes are common along convergent plate boundaries. When a tectonic plate subducts, it melts. This creates the thick magma needed for these eruptions. The Pacific Ring of Fire is dotted by composite volcanoes.


Q: What happens to a tectonic plate when it subducts?

 Choices:

- it warms

- it cracks

- it sinks

- it melts

A:
it melts
