Origin of Igneous Rocks: The Isotopic Evidence

Igneous rocks form from cooling magma Magma that erupts onto Earth's surface is lava The chemical composition of the magma and the rate at

1 Fig : Intrusive igneous rocks form at some depth within the crust due to slow cooling of magma, resulting in formation of large crystals Individual

rocket 888 Igneous rocks The first rocks on Earth were igneous rocks Igneous rocks are formed by the cooling and hardening of molten material called magma The word

ufarocket Igneous Rocks · Basalts are dark colored, fine-grained extrusive rock · Granite is an igneous rock that is composed of four minerals · Dacite is an extrusive