Question

Why does magma rise to Earth's surface?

Answer 1

Magma forms from partial melting of mantle rocks. As the rocks move upward (or have water added to them), they start to melt a little bit. ... Eventually the pressure from these bubbles is stronger than the surrounding solid rock and this surrounding rock fractures, allowing the magma to get to the surface.

Answer 2

Magma can rise when pieces of Earth's crust called tectonic plates slowly move away from each other. ... Magma also rises when these tectonic plates move toward each other. When this happens, part of Earth's crust can be forced deep into its interior. The high heat and pressure cause the crust to melt and rise as magma...

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Magma basically comes from the mantle part of the earth to the surface through the Weakest point of land from any where especially from volcanoes. As magma forms by melting of Igneous rocks underground due to high temperature and pressure. Exceptional diagensis and chemical process undergo silica contents makes it possible for magma to produce hot gases. With due to high viscosity of magma it is difficult to push it up, but the three thing play important role.

1. Hot gases behaves like carbon in soda. Soft gases, not heavier than air cause of it be to move with magma like hot balloon.
2. Pressure difference create big thunder hot spot under plate tectonic margins that is much more in the nech of volcanoes due to lesser area of it.
3. Movement of plates like subduction process in which land having greater density subsidize or moves down and create possibility of pressure upon lesser density magma. As a concequence of that activity, magma moves under consideration as thinking as ice on water. So recycling happens of land that develops morphology.

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