What factors control the formation of a magma?

What factors control the formation of a magma?

The main factors involved in the formation of magma are temperature, pressure, water content, and mineral composition.

How does grain size affect the cooling rate of magma?

If magma cools quickly, for example when basalt lava erupts from a volcano, then many crystals form very quickly, and the resulting rock is fine-grained, with crystals usually less than 1mm in size. If magma is trapped underground in an igneous intrusion, it cools slowly because it is insulated by the surrounding rock.

Why does magma rise from depth to the surface of Earth?

Why does magma rise from depth to the surface of the Earth? Answer: Magma rises toward the surface of the Earth because it is less dense than solid rock and buoyant relative to its surroundings. Buoyancy lifts magma upward through denser rock just as buoyancy lifts less dense Styrofoam upward through denser water.

What is the process in the mantle may be responsible for causing hot spot volcanoes to form?

What process in the mantle may be responsible for causing hot- spot volcanoes to form? Hot mantle plumes. Magma from deep within the mantle melts through the crust which is what causes hot spot volcanoes to form. As the asthenosphere rises it undergoes decompression which leads to melting.

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