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Igneous Rocks Do you know how they are formed? Watch to see if you can figure out how igneous rocks form. Did you figure it out? Igneous rocks are called fire rocks and are formed either underground or above ground. Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rocks. Igneous rocks are also formed when volcanoes erupt, casing the magma to rise above the earth's surface. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground. Review: Igneous rocks are formed either underground or _________. Above ground Melted Rock under the Earth’s surface is called _________? Magma Melted Rock above the Earth’s surface is called _________? Lava As pockets of magma cool slowly underground, the magma becomes ______________. Igneous Rocks