d) due to subduction, magma shoots out of the crust
At convergent boundaries, one tectonic plate typically subducts, or dives beneath, another plate. When an oceanic plate subducts beneath a continental plate or another oceanic plate, the descending plate heats up and melts partially as it is pushed into the hotter mantle. This partially melted plate material, known as magma, is less dense than its surroundings and can rise through the overlying mantle and crust to eventually erupt on the surface, forming a volcano. This process is responsible for creating volcanic arcs such as the Cascade Range in North America and the "Ring of Fire" around the Pacific Ocean.
why can volcanoes form at convergent boundaries?
a due to plates smashing into each other, the crust folds upward
b due to plates smashing together, the crust cracks and starts falling apart
c due to subduction, a great height difference occurs on the sea floor
d due to subduction, magma shoots out of the crust
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