Sedimentary Rocks

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by paulabravver
Last updated 6 years ago

Earth Sciences

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Sedimentary Rocks

Sedimentary Rocks

Clastic Sedimentary RockThis is the most well-known type of sedimentary rocks. They are made from pieces of previously existing rocks. The pieces of rocks are loosed by weathering. They are then transported to a weathering site and the sediment is trapped. The sediment then becomes buried deeply and is compacted together in layers. That is how clastic sedimentary rocks are formed. Sandstone is an example of a Clastic Sedimentray rocks.

Sedimentary rocks are formed from previously existing rocks or from pre-existing organisms. As an example, pebbles or mud can be compressed over time into layers and sedimentary rocks will be formed. The older layers are lower than the younger layers of sediments. This is because they are lithified over time. They can be formed in deserts, lakes, rivers, and seas.


Chemical Sedimentary RocksThese rocks are formed by chemical precipitation. This process begins when water traveling through rock dissolves some of the minerals which carries them away from their source. Once the water dissolves, all that is left is the minerals. Over time, this is how chemical sedimentary rocks are formed. An example is limestone.

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Biological Sedimentary RocksThese are formed when a large amount of living things pile up and are compressed with each other over a long period of time. This forms biological sedimentary rocks. As an example, carbon rich plant may form coal.

Clastic Sedimentary Rock

Chemical Sedimentary Rock

Biological Sedimentary Rock


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