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Why do magmas rise towards the Earth's surface?

Answer

Rocks become less dense when they melt.
Q&A Related to "Why do magmas rise towards the Earth's surface..."
Magma contains dissolved gases
http://www.chacha.com/question/what-happens-to-the...
4. None of the above. The reason is due to density differences. Magma is a liquid and liquids are less dense than solids. That creates a buoyancy effect that propels magma upward.
http://answers.yahoo.com/question/index?qid=200903...
When magma emerges as lava onto the surface, it starts to cool quickly. Returning to its solid state, lava turns into igneous rocks with crystal formations - and can also look like
http://www.ehow.com/info_8600842_flow-magma-affect...
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Why do magmas rise towards Earth's surface is due to its composition. Since it is of less density it is pressured upwards. They are the ones that are responsible ...
Magma is molten rock located within the Earthâ€â&dbquo;¢s mantle, which is a thick layer ...
As magma rises toward the surface, a change happens to the gases within it. The gases expand. This is because the pressure on them is released and so they rise ...
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