SEDIMENTARY ROCK PART I

The results of weathering and erosion of the earth's surface is the main ingredient sediments. The word comes from Latin sediments, sedimentum, which means the deposition. Sedimentary rocks exposed on land than most other rocks, igneous and metamorphic rocks, by 75 percent of land area, although only an estimated 5 percent of the volume of the outer portion of the earth. While it seems small, but the sedimentary rocks is very important in geology, because in it the history of recorded events geological past.

Sedimentary rocks are included in the secondary rocks because its constituent materials is the result of chemical activity and mechanical denudation of the rocks that already exists. Which precipitated from solution or suspension in water or air at normal temperature and pressure. Sediment is the result debris and crushed rock crust, composed of rock fragments, minerals and various other materials, transported by wind or water and deposited in indentations on land or at sea.

Material carried in suspension to settle for medium-speed transport detained or his physical condition changed. And the material deposited in solution due to changes in physical or chemical properties of the medium, or indirectly by the activities of animals and plants.
Sediment not only from inland sources, but can also accumulate on the edge of the basin-edge, which come down due to gravity.

Although theoretically not occurred below the water surface erosion, but there is still energy, water, waves and currents below the surface, which erode the coral reefs in the sea.
Results of scraping deposited around it, in the form of destruction.

Sedimentary material can be:
1. Fragments of an existing rock and minerals. For example in the river gravel, sand on the beach and mud in the sea or lake.
2. Organic material, such as coral reefs in the sea, the remains of shells of aquatic organisms and vegetation in the swamp.
3. The results of evaporation and chemical processes, brackish and salt didanau kasium in shallow marine carbonate.