Presentation on theme: "Sedimentary Rocks CH 3 Prentice Hall p. 82-86 CH 3 Prentice Hall p. 82-86."— Presentation transcript:
Sedimentary Rocks CH 3 Prentice Hall p CH 3 Prentice Hall p
Weathering Weathering Weathering: break down rocks on the surface into sediments. – Sediments : – Sediments : pieces of material that come from rocks or living things.
Weathering Mechanical (pg 213)Chemical (pg 215) Freezing & thawing Growth of plants Animal actions sediments wear down exposed rock Abrasion - sediments wear down exposed rock Water (solution) Oxygen (rust) Carbon Dioxide pollutants in the air make water vapor acidic. Acid Rain - pollutants in the air make water vapor acidic.
Which is a form of Chemical weathering? A Abrasion B Plants C Freezing & Thawing D Oxygen
Erosion Running water or wind carries away loose sediments.
Deposition When sediments are “dropped off” by the water or wind carrying it.
When sediment is carried away by wind or water. A Compaction B Erosion C Deposition D Weathering
Compaction Pressing rocks together due to gravity and the weight of overlying layers. – Layers build up over time – As layers form on top, press down and compact layers below – Creates visible layers
Cementation When dissolved minerals crystallize and glue sediment together. Occurs during compaction Dissolved minerals fill in the spaces between sediments.
When layers of sediment are pressed together by gravity. A Compaction B Cementation C Deposition D Weathering
Sedimentary rocks are formed by… A Human interactions B Cooling of molten material C Physical and chemical processes D Metamorphism
What to Work On Pink Letter Packet, Sedimentary Rocktray Take a Pink Letter Packet, a Sedimentary Rock, kit and a tray. With your partner, organize your rocks. Write down the numbers of the rocks in each group you make.
Sedimentary rock from rock fragments that are squeezed together. Clastic Rocks ShaleSandstoneConglomerate (Breccia)
Clastic Rocks Shale Common rock that forms from clay Thin, flat layers that split easily Smooth
Clastic Rocks Sandstone compacted cementedForms from sand that is compacted and cemented Mostly made of quartz Somewhat porous
Clastic Rocks Conglomerate / Breccia Mixture of grain sizes ConglomerateConglomerate has more rounded grains BrecciaBreccia has sharp- edged grains
Which process forms Sedimentary rock after it is deposited? A Mechanical Weathering B Erosion C Compaction D Chemical Weathering
The remains of plants and animals deposited in thick layers. Organic Rocks Coal From plants buried in swamps Compacted over millions of years Limestone From shells of aquatic animals (Calcite) Some shells are compacted, some dissolve Dissolved calcite cements it together.
Chemical Rocks Forms when dissolved minerals crystallize. Rock Salt Forms from evaporation. Made of halite. Gypsum Forms from evaporation. Limestone Forms from dissolved calcite.
Organic Which of these is an Organic rock? A Shale B Sandstone C Conglomerate D Limestone
Chemical Which of these is a Chemical rock? A Shale B Sandstone C Conglomerate D Limestone
Uses of Sed. Rocks Sandstone and Limestone are commonly used as building material Easily cut into slabs Limestone is used in cement.
What to Work On Look at the groups you made and reorganize them by the 3 types – Clastic, Organic, Chemical How did your groups change? Note the different textures. How do they compare to the Igneous rocks?
NOT Which of these does NOT describe how Sedimentary rocks are classified? A What it’s made of B Size of grains C If it was compacted D If it crystallized