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metamorphic rock
Metamorphic rocks
metamorphic rock
A gneiss is a metamorphic rock. Metamorphic rocks are created by the alteration of rocks by heat and pressure. Therefore, a gneiss may be created from an igneous rock in which case it would be called an orthogneiss.
They can be if that is what you what one to be made from.
Foliated are made of interlocking crystals, non-foliated are not.
Metamorphic rocks are either created at great depth, or at contact zones with magmatic intrusions.
Metamorphic rocks are made from the action of heat, stress, and pressure on pre-existing rocks, of either an igneous, or a sedimentary origin. Also, sometimes a metamorphic rock can be resculpted to form another metamorphic rock.
Igneous rocks, Sedimentary rocks Metamorphic rocks.
There are three major types of rock: igneous (formed from the cooling and solidification of magma or lava) sedimentary (laid down as sediments) and metamorphic (changed by heat and/or pressure)
Sedimentary rocks. and metamorphic rocks made form sedimentary rocks.
igneous rocks are made of lava that cools and hardens and metamorphic rocks are madeby heat and pressure.