Answer:
A. "Melting" at convergent plate boundaries has many causes. The subducting plate heats up as it sinks into the mantle. Melting in the mantle above the subducting plate leads to volcanoes within an island or continental arc.
B. Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth's tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
C. A volcanic "hotspot" is an area in the mantle from which heat rises as a thermal plume from deep in the Earth. ... This melt, called magma, rises through cracks and erupts to form volcanoes. As the tectonic plate moves over the stationary hot spot, the volcanoes are rafted away and new ones form in their place.
Explanation:
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