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They can be formed underground or above ground. Underground, they are formed when melted rock, called magma, deep under the earth's surface is trapped in small pockets. As these pockets of magma cool slowly underground, the magma develops into igneous rocks.

Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's crust. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground.

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โˆ™ 2009-06-08 10:32:36
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โˆ™ 2013-08-17 09:24:56

Igneous rocks are formed because molten substance within the earths surface cools and solidifies inside or outside the earth crust.

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Q: Why are igneous rock formed?
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