Under the influence of buoyancy, the melt rises. Diapirs may also form in non-silicate bodies, playing a similar role in moving warm material towards the surface.

Dikes

A dike is a vertical fluid-filled crack, from a mechanical standpoint it is a water filled crevasse turned upside down. As magma rises into the vertical crack, the low density of the magma compared to the wall rock means that the pressure falls less rapidly than in the surrounding denser

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