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What does it happen after the magma is formed?
Question Date: 2016-08-10
Answer 1:

Magma or liquid rock is less dense than the solid that melts to form it. Consequently like a balloon filled with hot air (relative to the surrounding cooler air) the magma is buoyant ...it tends to move upwards in the gravitational field of the Earth.

As it moves upwards magma cools because heat is transferred from the hot magma to the cooler solid rock surroundings and also because the magma expands as it decompresses. If it losses enough heat it can actually freeze at depth. But if magma moves quickly enough it will not lose sufficient heat to crystallize (freeze), and exploiting or creating cracks and fractures, it can ascend and erupt upon the Earth's surface.

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