Igneous Rock
Igneous is one of the three rock families.
Igneous rock forms when when hot magma or lava cools and become solid. Magma is melted rock found deep in Earth where temperatures and pressures are high. Any rock that is heated at a very deep level can melt into magma. Lava is molten rock on the Crust of Earth. Igneous rocks that cools beneath the surface is Intrusive and rock cooled on the outside of Earth is Extrusive. Granite is an example of an intrusive rock. Sometimes hot magma pushes up to the surface through cracks in the Earth. Volcanic rock like obsidian, pumice, and scoria become Extrusive.
Igneous rock forms when when hot magma or lava cools and become solid. Magma is melted rock found deep in Earth where temperatures and pressures are high. Any rock that is heated at a very deep level can melt into magma. Lava is molten rock on the Crust of Earth. Igneous rocks that cools beneath the surface is Intrusive and rock cooled on the outside of Earth is Extrusive. Granite is an example of an intrusive rock. Sometimes hot magma pushes up to the surface through cracks in the Earth. Volcanic rock like obsidian, pumice, and scoria become Extrusive.
Intrusive
Intrusive rock also called Plutonic rock formed from cooled magma inside Earth, it is known as Intrusive Igneous rock. Igneous rock formed from Magma forced into older rocks deep within the Earths Crust, then slowly cools or solidifies below the surface of Earth, though it may later be exposed because of erosion. Igneous intrusions form a variety of rock types.
Extrusive
Igneous rocks which form by the crystallization of magma at the surface of Earth called are called extrusive rocks. They are characterized by fine-grained texture because their rapid cooling at or near the surface of Earth did not provide enough time for large crystals to grow.