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Why are ocean ridges centers of volcanic activity?
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tectonic basins and rift valleys
Escarpments of the Great Rift Valley rising above the plain north of Samburu Game Preserve, central Kenya. Beisa oryxes graze in the foreground.
Ocean ridges are centers of intense volcanic activity because they are located at divergent plate boundaries, where tectonic plates move apart from one another. As these plates separate, the reduction in pressure allows magma from the mantle to well up toward the surface.1234
This upwelling magma cools and solidifies to create new oceanic crust along the trailing edges of the diverging plates, a process known as seafloor spreading. The axis of these ridge systems typically features a "neovolcanic zone," where recent and active volcanism occurs, often marked by chains of small volcanoes or volcanic ridges. This continuous supply of magma not only forms new crust but also sustains the elevated topography of the ridge system itself.1235