Question

volcanics are formed by the movement of plates​

Answer 1

Answer:

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Explanation:

A volcanic eruption at Surtsey, a small island near Iceland. At divergent plate boundaries hot mantle rock rises into the space where the plates are moving apart. ... Hot mantle rock rises where the plates are moving apart. This releases pressure on the mantle, which lowers its melting temperature.

Answer 2

Answer:

Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Since it is lighter than the solid rock around it, magma rises and collects in magma chambers. Eventually, some of the magma pushes through vents and fissures to the Earth's surface