Presentation on theme: "Sedimentary Rock c. Classify rocks by their process of formation."— Presentation transcript:
1Sedimentary Rock c. Classify rocks by their process of formation. d. Describe processes that change rocks and the surface of the earth.
2Sedimentary RockFormed from particles of sediment deposited by wind and water.Sediment is small pieces of solid materials that come from rocks or living things.
3StratificationYes, all these rocks are layered or “stratified.”
4WeatheringThe process by which exposed rock is broken down into small pieces by the elements of nature (wind, rain, ice, chemical actions, plants, etc.)
5Origins of Sedimentary Rock Wind, water, ice, sunlight, and gravity all cause rock to physically weather into fragments.Through erosion, these rock and mineral fragments, called sediment, are moved from one place to another.The sediment is deposited in layers, and eventually newer layers cover the older layers.
6ErosionOccurs when water or wind loosens rock and soil and carries it away.
7DepositionThe process by which the sediment settles out of the water or air carrying it.Sediment is deposited when the wind or water slows down.
8CompactionAs the sediments settle they will loosely fit on top of each other.As the years go by, more and more sediment is added.The bottom layers get compacted by the weight of the layers above them.
9CementationWhile compaction is going on, minerals in the rock slowly dissolve.The dissolved minerals seep into the spaces between the compacted sediment.They crystallize and glue the sediments together.
10Lithification The process by which sediment becomes sedimentary rock. From Greek word “lithos,” which means rock.ErosionDepositionCompaction
11Types of Sedimentary Rock Clastic: formed when rock fragments are squeezed together.Organic: (biological) formed from the remains of living things.Chemical: formed when dissolved minerals crystallize.
12Conglomerate and Breccia Formed from a mixture of rock fragments of different sizes.Conglomerate has rounded edges.Breccia has larger fragments with sharp edges
13SandstoneFormed from sand on beaches, ocean floors, river beds, and deserts.Mainly quartz.
14Shale Clastic rock formed from tiny particles of clay. Water deposits tiny clay particles in thin layers.Feels smooth and splits easily into flat sheets.
15Organic Sedimentary Rock Formed from the remains of plants and animals that were deposited in thick layers.Also called biological rock.
16Coal Formed from the remains of ancient swamps. As layer upon layer of dead plants built up, the bottom layers were compacted into coal.Stored chemical energy
17Limestone Formed from the shells of ancient sea animals and plants. Shells fall to the bottom of the ocean in layers, some 100’s of meters thick.Compaction creates limestone.
18Chalk Formed from the shells of ancient sea life. Creates layers 100’s of feet thick.White Cliffs of Dover
19Chemical Sedimentary Rock Formed when water with dissolved minerals evaporates.The left behind minerals will crystallize.
20Halite Rock Salt Formed from seas and oceans that dried up. The salt forms large crystals.
21GypsumMade from calcium deposits.Used to make sheet rock for homes.