Volcanic activity is common around marine trenches. Give reason.
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The trenches have crustal friction near the surface and deep into the crust as subduction forces one plate under another. ... These data from volcanoes, as well as earthquake locations, help to substantiate the model of plate tectonics.
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The trenches have crustal friction near the surface and deep into the crust as subduction forces one plate under another. At oceanic ridges most of the crustal movement is near the surface as sea-floor spreading causes plates to move apart and new crust is formed by magma pushing up from the mantle.
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