Igneous Rocks: How Are They Formed?

igneous rock  When the magma cools and solidifies beneath the earth's crust it is called intrusive igneous rock, while that which exits the crust and cools on What are Igneous Rocks? · Dacite is a fine-grained, extrusive igneous rock that is usually light in color · Diorite is a coarse-grained, intrusive igneous rock

Igneous Rocks ▫ Igneous rocks are formed by the cooling of molten rock ▫ There are two major states of molten rock: Magma and Lava ▫ Magma is a form of The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye Examples of phaneritic igneous rocks are

Igneous rock comprises a large amount of the planet earth's crust To illustrate, geologists today understand that about 90% of the earth's oceanic crust, and An ultramafic, coarse-grained igneous rock Peridotite will form under Earth's surface from slowly-cooling magma It is less rare than Komatiite,