During seafloor spreading, most volcanic magma is produced at mid-ocean ridges, where tectonic plates are diverging. As the plates separate, magma from the mantle rises to fill the gap, creating new oceanic crust. This process results in volcanic activity, forming underwater volcanoes and contributing to the growth of the ocean floor. The continuous cycle of magma generation and solidification at these ridges is a key mechanism in plate tectonics.
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