Sedimentary rocks form a thin layer of rock over 75 per cent of the Earth's surface. They are the site of very important resources such as ground water, coal, oil, and soil. Shale, sandstone, and limestone are the most common types of sedimentary rocks. They are formed by the most common mineral that is found on or near the surface of the Earth. The mineral that forms these sedimentary rocks is feldspar.
Running water, such as the mountain stream above, sorts and transports more sediment than any other agent of deposition.
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