Why Do Magmas Rise toward Earth's Surface?

Answer

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 for forming the volcanoes and tall rocky formations.
Q&A Related to "Why Do Magmas Rise toward Earth's Surface?"
Rocks become less dense when they melt.
http://wiki.answers.com/Q/Why_do_magmas_rise_towar...
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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