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An igneous rock is one formed from the cooling and solidification of magma or lava. Examples include basalt, rhyolite, pumice, scoria, granite, diorite, gabbro, and obsidian. â¦ Magma solidifying under the surface results in coarser grained intrusive igneous rock.
Igneous Rocks Igneous rocks form from the solidification of magma (molten rock). A reminder: magma is molten rock beneath the Earth s surface and lava is magma that is on the Earth s surface.The main characteristics of an Igneous rock are crystal size (grain size) and texture. The crystal size and texture of an igneous rock is dependant on where in the earth the rock formed. reminder: magma is molten rock beneath the Earth s surface and lava is magma that is on the Earth s surface. The main characteristics of an Igneous rock are crystal size (grain size) and texture. The crystal size and texture of an igneous rock is dependant on where in the earth the rock formed.