Presentation on theme: "AIM: How are Sedimentary Rocks Formed? Do Now: Take out your ESRT and turn to page 7. Look at the chart called Scheme for Sedimentary Rock identification."— Presentation transcript:
AIM: How are Sedimentary Rocks Formed? Do Now: Take out your ESRT and turn to page 7. Look at the chart called Scheme for Sedimentary Rock identification and answer the questions below. 1)What textures of Sedimentary rocks will we be working with? 2)What material (not composition) are Clastic rocks made from?
I. Formation of Sedimentary Rocks - Sedimentary refers to “small pieces” - these rocks are made from other rocks, once living things and precipitates. - sediments are small pieces of rock. ConglomerateRock salt Bioclastic Limestone
- the breaking down of rocks into little pieces - the transport of little pieces of rock by water, wind or ice. - When the little pieces stop moving. They stop because the agent of erosion stops. Weathering Erosion Deposition II. How do you make Sedimentary rock?
Compaction and Cementation – squeezes and glues sediments together forming a rock. –Pressure of overlying material squeezes –Minerals dissolved in water act as glue *This process is also known as Lithification
III. Classification of Sedimentary Rocks A. Clastic (fragmental) – composed of weathered bits of rocks and minerals. - Categorized by particle size. Conglomerate and Breccia (Pebbles) Sandstone (sand) Siltstone (silt) Shale (clay)
B. Crystalline (Chemical) (precipitates)– -Forms when dissolved minerals precipitate from watery solutions. -Water evaporates and leaves material behind to form rocks. LimestoneRock salt
C. Bioclastic Sedimentary rocks - Composed of once living things (plants and shells). Limestone Bituminous Coal Limestone
With your partner, take 3 min to walk around the room and find the 4 cards labeled Rock A, B, C, D, E, F and G. Identify the Texture of each group of rocks at the card using your notes we just took.
IV. Features of Sedimentary Rocks 1.Layers – continuous depositions of sediments causes a layering effect. (like sand art) 2. Fossils – traces of remains of ancient life.