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Volcanoes are located often near trenches because when two tectonic plates collide at a convergent boundary, the denser plate slides under the other plate. As the denser plate bends, a deep depression known as a trench forms. At a trench, one plate moves downward into the mantle. As the plate moves farther downward into Earth's mantle, the rock is subjected to greater heat and pressure. As a result, the plate releases fluids, which causes surrounding rock to melt. This as you know is a volcano.

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12y ago
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12y ago

because they are some volcanoes near trenches.

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Q: Why do volcanoes occur near trenches?
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