There are two main types of metamorphic rocks: those that are foliated because they have formed in an environment with either directed pressure or shear stress, and those that are not foliated because they have formed in an environment without directed pressure or relatively near the surface with very little pressure at all. Rocks are formed on earth as igneous, sedimentary, or metamorphic rocks igneous rocks form when rocks are heated to the melting point which forms magma sedimentary rocks are formed from the cementing together of sediments , or from the compaction (squeezing together) of sediments, or from the recrystallization of. In this lesson you will learn about metamorphic rocks, how they form, and some of their common uses figure 422 shows a large outcrop of metamorphic rocks notice the platy layers that run from left to right within the rock it looks as though you could easily break off layers from the front surface of the outcrop this layering. A brief introduction to metamorphic rocks you can download a copy of the flowchart at visit my website at mikesammartano. Metamorphic rocks form when high temperatures and pressure act on a rock to alter its physical and chemical properties (metamorphism means 'to change form ') these conditions often stretch, twist and fold the rock as it cools in metamorphic rocks some or all of the minerals in the original rock are replaced, atom by atom,. Metamorphic rocks-a metamorphic rocks i metamorphic rocks form deep within the earth when heat and pressure are applied to either igneous rocks or sedimentary rocks this heat and pressure in essence cooks the rocks, changing their structure substantially metamorphic rocks the rocks are partially melted and the. 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 the preexisting rocks may be igneous, sedimentary,.
Rocks that have been formed from other rocks, sedimentary and igneous, by internal changes caused by pressure, heat, and the chemical action of the solutions and hot gases, are called metamorphic rocks and here is a list: crystalline limestone crystalline limestone is a rock that results from the. Earth movements can cause rocks to be deeply buried or squeezed as a result, the rocks are heated and put under great pressure they do not melt, but the minerals they contain are changed chemically, forming metamorphic rocks sometimes, metamorphic rocks are formed when rocks are close to some molten magma,. 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 mineral-rich fluids or, more commonly, some combination of these factors. Get information, facts, and pictures about metamorphic rocks at encyclopedia com make research projects and school reports about metamorphic rocks easy with credible articles from our free, online encyclopedia and dictionary.
Metamorphic rocks are created by the physical or chemical alteration by heat and pressure of an existing igneous or sedimentary material into a denser form due to the action of plate tectonics, compression, stress and shearing forces over long periods of time, rocks can be essentially warped and deformed, causing them. Rocks undergoing metamorphism mostly remain solid, and do retain some characteristics of their former rock their final structure, texture and composition are somewhat controlled by the original rock composition to get a good understanding of this, let's start out with an animation that shows metamorphic rock formation.
Metamorphic rocks metamorphism is the alteration of pre-existing rocks in the solid state due to changes in temperature and pressure under increasing temperature and / or pressure existing minerals become unstable and break down to form new minerals in the case of regional metamorphism the rocks are subjected to. Metamorphic rocks were once igneous or sedimentary rocks, but have been changed (metamorphosed) as a result of intense heat and/or pressure within the earth's crust they are crystalline and often have a “squashed” (foliated or banded) texture.
Metamorphic rock is rock that has been altered by heat or by heat and pressure ' metamorphic' means 'change of form' heat and pressure can change the forms of many things, for example, a glassmaker uses heat to change a certain kind of sand into glass rocks change when mountain-building forces apply a great deal. The word metamorphic means of changed form metamorphic rocks are rocks that have been changed from one form, such as igneous or sedimentary, to another this can occur when a given rock is exposed to intense heat, pressure, or hot fluids recalling igneous rocks, the specific rock that forms from a given magma.
A metamorphic rock used to be some other type of rock, but it was changed inside the earth to become a new type of rock the word metamorphism comes from ancient greek words for “change” (meta) and “form” (morph) the type of rock that a metamorphic rock used to be, prior to metamorphism, is called the protolith. Foliated metamorphic rocks are formed within the earth's interior under extremely high pressures that are unequal, occurring when the pressure is greater in one direction than in the others (directed pressure) this causes the minerals in the original rock to reorient themselves with the long and flat minerals aligning. Metamorphic rocks are formed through the transformation of pre-existing rocks in a process known as metamorphism (meaning “change in form”) the original rock , or protolith, is subjected to heat and pressure which cause physical, chemical and mineralogical changes to the rock protoliths may be igneous, sedimentary or.