Answer
Volcanism at divergent plate boundaries is most often associated with basaltic rock types. In these settings, rocks melt primarily due to decompression melting. As tectonic plates move apart, the pressure on the underlying mantle decreases, causing it to undergo decompression. This reduction in pressure lowers the melting point of the mantle rocks, leading to the formation of magma. The melted material, which is predominantly basaltic in composition, rises to the surface through fissures and fractures, resulting in volcanic activity such as the formation of lava flows and volcanic cones.
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