3 types of sedimentary rocks 1. clastic: shale, sandstone, conglomerate 2. chemical: sedimentary rocks formed when form when dissolved materials precipitate from solution (by evaporation or chemical action) E.g. rock salt, some limestones 3. organic
Limestone forming environment a coral reef system from the Kerama Islands in the East China Sea southwest of Okinawa. Here the entire seafloor is covered by a wide variety of corals which produce calcium carbonate skeletons.
coal forms from the accumulation and preservation of plant materials, usually in a swamp environment
3 types of sedimentary rocks 1. clastic 2. chemical 3. organic How do clastic rocks form
Clastic rocks 1. Come from the weathering of other rocks. 2. From small to large fragments, ranging from pebbles to gravels to microscopic flakes. 3. Carried by winds, waves, and water. 4. sediments are deposited when a stream slows down.
Clastic rocks 5. IMPORTANT: Dissolved minerals like silica, calcite, and iron oxide act as cement, or glue. These minerals settle into the spaces between sand grains or pebbles, and bind the fragments.