Examples of igneous rocks include granite, pegmatite, diorite, gabbro, dunite and peridotite. Other examples of igneous rocks are kimberlite, rhyolite, quartz porphyry, dacite, latite, andesite, basalt, obsidian and pumi... More » Science Earth Science Geology

Igneous rocks rarely contain fossils because the formation of a fossil requires sedimentation. A fossil results when the remains of a plant or animal are covered by sediment that hardens, forming the mold that eventually... More » Science Earth Science Geology

Some uses of igneous rock include serving as material for buildings and roads. Igneous rocks reduced to gravel size serve as ballast for railroad beds. Igneous rocks are also used for countertops, backsplashes and sinks.... More » Science Earth Science Geology
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Some examples of intrusive igneous rocks are granite, diorite, syenite, gabbro and pyroxenite. These rocks were formed over eons in magma chambers deep in the earth under high pressure and high temperatures. More » Science Earth Science Geology

Possible parent rocks of gneiss are granite, shale, gabbro or diorite. Some rocks metamorphose, or change, from one particular kind of rock, but gneiss forms from one of several types. Another name for the parent rock is... More » Science Earth Science Geology

Gneiss is formed from the high-temperature metamorphism of existing igneous rocks, generally granite or diorite. The rocks that form gneiss are exposed to extreme pressures and temperatures of between 600 and 700 degrees... More » Science Earth Science Geology

Granite and gabbro are igneous rocks formed through the cooling and crystallization of magma in the Earth's crust. They are identified by their specific mineral content and composition. More » Science Earth Science Geology