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To the sedimentary rocks of western Pennsylvania to see bituminous, and to the metamorphic rocks of eastern Pennsylvania to see anthracite.
Along with igneous and metamorphic rocks, sedimentary rocks are one of the three primary categories of rocks. They are created by the compaction of sediments from the ocean or other activities on or near the Earth's surface.
In contrast to metamorphic and igneous rocks, which are generated deep beneath the Earth, sedimentary rocks are formed on or around the surface of the planet. Erosion, weathering, dissolution, precipitation, and lithification are the main geological processes that result in the formation of sedimentary rocks.
The impacts of wind and rain, which gradually reduce huge boulders into smaller ones, are included in erosion and weathering.
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