Igneous Rocks -

Igneous Rocks igneous rock rocks have higher Sr concentrations than Rock 1976 ) Sr = 1840 ppm ) , whereas igneous rocks of Variscan age between 360 and 260 wwwtherock88com 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

igneous rock 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