Plates circulate apart on mid-ocean ridges in which brand new seafloor models Between the two dishes was a rift valley. Lava circulates within skin cool quickly to be basalt, however, higher from the crust, magma cools a lot more slow to make gabbro. So the entire ridge method is composed of igneous material which is… Continue reading Plates circulate apart on mid-ocean ridges in which brand new seafloor models