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Fractures that form by the contraction of lava as it cools and solidifies are called extrusive igneous rocks
How are extrusive igneous rocks formed?
Igneous Extrusive Rocks: Igneous rock that is extrusive or volcanic is created when magma cools above (or very close to) the Earth's surface. These are the kinds of rocks that are created by erupting volcanoes and gushing fissures. When molten rock erupts on the surface, the magma, also known as lava, cools and solidifies.
How are igneous rocks composed?
When magma rises to the surface of the Earth and cools as lava, it forms extrusive, or volcanic, igneous rock. Lava cools quickly when exposed to the air's comparatively cool temperatures, which gives mineral crystals little time to develop. As a result, the texture of the rocks becomes extremely fine-grained or almost glassy.
What do igneous rocks that cool below the surface of the earth consist of?
Intrusive igneous rocks are igneous rocks that cool beneath the surface of the Earth. When magma explodes onto the surface of the Earth, extrusive igneous rocks are created. Lava is the term for magma that flows to the surface. The molten rock or lava rapidly cools as it comes into contact with air and water.
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