The same process applies for metamorphic rocks, which weather and erode to form sediments that are then lithified. High temperatures and pressures compact the sediment enough to expel water and cement the grains into a sedimentary rock. Eventually the sediment originally from eroded igneous rocks gets buried deep enough that the sediments begin to lithify. This sediment continually piles on top of one another. Imagine how much sediment the Mississippi River transports from the continent into the Gulf of Mexico. This process results in an accumulation of sediment that continually buries deeper sediment. Igneous or metamorphic rocks to sedimentary rocks - As igneous rocks weather and erode from mountains they are transported by water and wind down slope to sedimentary basins such as lakes or oceans. Metamorphic rocks are dependent on the degree of melting, where complete melting "resets" the rock to magma and will then form igneous rocks when cooled. Metamorphic rocks are a formed from the partial melting of previously existing material, either sedimentary, igneous, or older metamorphic rocks.Magma that is ejected to the surface of Earth a volcanic eruption or at a spreading center cools very quickly, contains small crystals typically and is called an extrusive igneous rock. A rock that cools within Earth's crust will cool very slowly and form larger crystals and is called an intrusive igneous rock. This cooling magma crystalizes to form rocks like the granite in your house. Igneous rocks are formed from cooling magma deep in Earth's crust or mantle.Sedimentary rocks often contain fossils from marine organisms or are entirely made up of fossils in the case of many carbonates around the world. Sediments can be either abiogenic or biogenically sourced. As you bury sediment deeper and deeper into the crust, temperatures and pressures increase to the point that the individual grains are cemented together or lithified. Sedimentary rocks are rocks formed from the compression of sediments, dirt, or sand we see on the surface of Earth today.The igneous rock formed from cooled magma or lava may follow a completely different path through the rock cycle the next time. Subducted metamorphic rocks melt as they are pushed deeper into Earth at subduction zones. These sedimentary rock layers, if exposed to heat and pressure at convergent plate boundaries, are transformed to metamorphic rock. Water moving through the layers deposits minerals, which cement the sediments together to form sedimentary rock. The sediments form layers layers near the bottom are compacted by the weight of layers above. Over thousands of years, igneous rock breaks apart (weathers), and the bits of rock (sediments) are moved (eroded) by wind, water, ice, and gravity. One example of rocks changing from one type to another is as follows: As liquid magma deep within Earth moves closer to the surface, it cools and hardens, forming igneous rock. There is no one set “path” through the rock cycle. #Key words rock cycles series#Rocks can change from one type to another through a series of processes known as the rock cycle.
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