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Date : 2010-08-01
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What are metamorphic rocks USGS ~ Metamorphic rocks started out as some other type of rock but have been substantially changed from their original igneous sedimentary or earlier metamorphic form Metamorphic rocks form when rocks are subjected to high heat high pressure hot mineralrich fluids or more commonly some combination of these factors
Metamorphic Rocks National Geographic Society ~ Rocks that undergo a change to form a new rock are referred to as metamorphic rocks In the rock cycle there are three different types of rocks sedimentary igneous and metamorphic Sedimentary and igneous rocks began as something other than rock Sedimentary rocks were originally sediments which were compacted under high pressure
metamorphic rock Definition Formation Facts Britannica ~ Metamorphic rock any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions such as variations in temperature pressure and mechanical stress and the addition or subtraction of chemical components
Metamorphic rock Wikipedia ~ Metamorphic rocks arise from the transformation of existing rock types in a process called metamorphism which means change in form The original rock protolith is subjected to heat temperatures greater than 150 to 200 °C and pressure 100 megapascals 1000 bar or more causing profound physical or chemical change
Metamorphic Rocks Definition Examples Types Quiz ~ Examples of Metamorphic Rocks Metamorphic rocks are less common than sedimentary and igneous rocks but still make up approximately 12 of rocks at the surface Some of the most common types of metamorphic rocks are Slate Slate is a metamorphic rock that forms under relatively gentle heat and pressure conditions applied to shale a
What Makes Metamorphic Rocks So Unique ~ The presence of mineral layers called foliation is an important feature for classifying metamorphic rocks As strain increases the foliation becomes more intense and the minerals may sort themselves into thicker layers The foliated rock types that form under these conditions are called schist or gneiss depending on their texture
Metamorphic Rocks Pictures of Foliated and NonFoliated ~ Metamorphic rocks have been modified by heat pressure and chemical processes usually while buried deep below Earths surface Exposure to these extreme conditions has altered the mineralogy texture and chemical composition of the rocks Minerals Information about ore minerals gem materials
Metamorphic Rock Types Pictures and Descriptions ~ Metamorphic rocks are an important topic in geology These are the rocks that form by the effects of heat pressure and shear upon igneous and sedimentary rocks Some form during mountainbuilding by forces of others from the heat of igneous intrusions in regional metamorphism others from the heat of igneous intrusions in contact metamorphism
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