The Rock Cycle

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  • The rock cycle is a process that involves changes to occur in certain groups. These groups are igneous rocks, sedimentary rocks, and metamorphic rocks. The rock cycle is a process that can begin anywhere. One common way is starting as igneous rocks. The start of the formation is when a volcano erupts causing lava to spread along the surface. When the lava reaches the surface, it cools quickly causing small crystals to form (igneous rocks). 
  • The next process is when weathering takes place. When it rains, the igneous rocks start to erode and get broken down. Once the erosion has taken place the rocks get moved by the wind and end up landing in rivers. 
  • When the rocks land in rivers, the stream drags the rocks along. The specifc term to call the broken rocks are known as sediments. Once the sediments reach the mouth of the river they fall to the bottom of the ocean.
  • Once the sediments reach to the bottom of the ocean this is where a new form of rock is created. This group is called sedimentary rocks. The process starts off with the eroded sediments, dead fish and dead plants combining together due to the pressure of the water. Then, over time more sediments and dead organisms will pile on top of each other forming layers. During this process, the bottom layer will start to turn into sedimentary rocks. 
  • After the sedimentary rocks are formed pressure and heat are applied. During this process, the sedimentary rocks start to change into metamorphic rocks. These metamorphic rocks are formed from other rocks that have been changed due to heat and pressure.
  • Sedimentary rocks -------> Metamorphic rocks
  • When the metamorphic rocks are formed they use the process of melting. When they melt they are turned into magma (lava). After this, the rock cycle starts over. However, in the rock cycle there are other changes which take place. For example, igneous rocks can have heat and pressure applied which then allows them to form metamorphic rocks or another example would be that metamorphic rocks can be eroded and affected by weathering which forms them into sediments. 
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