. What is the importance of magma composition?
Most of the mantle and crust are solid, so the presence of magma is crucial to understanding the geology and morphology of the mantle. Differences in temperature, pressure, and structural formations in the mantle and crust cause magma to form in different ways.
How magma is formed?
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.As they rise, gas molecules in the magma come out of solution and form bubbles and as the bubbles rise they expand.
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