when is sedimentary rocks undergoes several change what is it forms
Answers
Answer:
sedimentary rocks are formed from sediment deposits through the process of weathering, erosion, deposition and finally compaction and cementation. Examples of sedimentary rocks include mudstone, limestone, sandstone, and conglomerate.
Explanation:
All rocks, be it igneous, metamorphic, or the already existing sedimentary rocks are constantly subjected to weathering and erosion. Tiny debris from the rock masses and mountains are eroded together with soils, sand, and other granite pieces are normally washed from highlands to low areas. After many years, these materials finally settle down through the process of sedimentation. Some may accumulate under water and others on the lower areas of the land.
The weathering and erosion is normally due to the forces of water, thermal expansion, gravity, wind, and salt crystal expansion that breaks down the pre-existing rocks into small pieces and then carried away to some distance low areas. As the materials move, they are smoothened and rounded by abrasion, and they settle down by leaving pore spaces between the grains which make them achieve their distorted shape.
At this point, they are deposited a layer after layer to form a new sheet of homogenous material. From here, the compaction and cementing agents such as oxides, carbonates, and silica combine together with the deposited material.
The compaction effect due to the weight of the piling layers of materials reduces the porosity of the rocks formed and intensifies the cohesion between the grains. At times, fossil fuels and organic matter may settle within the sediments leading to cementation. Cementation is the gluing of the rock pieces together either by salt compounds or organic matter. When these materials eventually harden, the mixture is transformed into a rock.
Thus, sedimentary rocks are formed from sediment deposits through the process of weathering, erosion, deposition and finally compaction and cementation.
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