Sedimentary Rocks

Sedimentary rocks are one of three main species of rocks, in addition to igneous and also metamorphic. Castle are developed on or close to the Earth’s surface ar from the compression of ocean sediments or other processes.

You are watching: Rock is formed when debris is buried, compressed and cemented together.


Sedimentary Rock

An instance of a sedimentary rock, which is, by definition, composed that many, smaller rocks.

Photo courtesy that Alamy stock Photo


Sedimentary rocks are created on or near the Earth’s surface, in contrast to metamorphic and igneous rocks, i m sorry are developed deep in ~ the Earth. The most essential geological processes that cause the creation of sedimentary rocks space erosion, weathering, dissolution, precipitation, and lithification.

Erosion and weathering incorporate the results of wind and rain, which slowly malfunction large rocks into smaller ones. Erosion and also weathering change boulders and also even mountains right into sediments, such together sand or mud. Dissolution is a form of weathering—chemical weathering. With this process, water the is slightly acidic gradually wears away stone. These 3 processes create the raw materials for new, sedimentary rocks.

Precipitation and also lithification are processes that build new rocks or minerals. Precipitation is the development of rocks and also minerals indigenous chemicals the precipitate from water. Because that example, together a lake dries up over countless thousands the years, it pipeline behind mineral deposits; this is what taken place in California’s death Valley. Finally, lithification is the procedure by which clay, sand, and other sediments on the bottom that the s or other bodies the water are slowly compacted right into rocks from the load of overlying sediments.

Sedimentary rocks deserve to be organized into two categories. The very first is detrital rock, which originates from the erosion and accumulation of absent fragments, sediment, or other materials—categorized in total as detritus, or debris. The other is chemical rock, produced from the dissolution and precipitation that minerals.

Detritus deserve to be either organic or inorganic. Necessary detrital rocks form when parts of plants and also animals degeneration in the ground, leaving behind biological material the is compressed and becomes rock. Coal is a sedimentary rock formed over numerous years from compressed plants. Inorganic detrital rocks, on the various other hand, are created from broken up piece of other rocks, no from life things. This rocks space often called clastic sedimentary rocks. Among the best-known clastic sedimentary rocks is sandstone. Sandstone is developed from great of sandy sediment the is compacted and lithified.

See more: To An Engine, Oil For 350 Small-Block, Oil For Old Small

Chemical sedimentary rocks have the right to be found in many places, from the s to deserts come caves. Because that instance, many limestone forms at the bottom the the s from the precipitation that calcium carbonate and the remains of marine animals with shells. If limestone is found on land, it can be assumed that the area provided to be under water. Cavern formations are also sedimentary rocks, yet they room produced very differently. Stalagmites and stalactites form when water passes with bedrock and also picks increase calcium and carbonate ions. As soon as the chemical-rich water provides its method into a cave, the water evaporates and leaves behind calcium carbonate on the ceiling, developing a stalactite, or on the floor of the cave, producing a stalagmite.