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What is weathering? Physical/Mechanical Weathering: Abrasion ___________________________ Water seeps into small cracks in rocks. When the water freezes it expands creating great pressure. The crack widens and allows water to seep deeper into the rock. ___________________________ • Rocks formed deep in the Earth are made under high pressure. • When the pressure is released the rocks expand & crack. • May also be caused by alternate heating and cooling of rocks by weather conditions. Gravity _______________________ o Tiny root hairs seek out small cracks and pits in rock. o Once the root hairs find a place they grow and expand. o The expansion causes great pressure and cracks the rock. Chemical Weathering: Carbonation Oxidation Biological Weathering: Rate of Weathering: Acid Rain Hydrolysis Plant Acids Let’s Practice! Match each weathering term to the examples. <We have talked about most of them.> See if you can figure the rest out! Then sort the types of weathering. Frost Action _________ A. Feldspar turns into clay Plant acids _________ B. Blurred inscription on grave markers Hydrolysis _________ C. Carbonic acid dissolves rock Abrasion _________ D. Large sheets of rock break away from outcropping Gravity _________ E. Red soil or rocks Sulfuric Acid _________ F. Formation of potholes in winter Oxidation _________ G. Rocks falling from high places Organic activity _________ H. Lichens growing on rocks Wetting & drying _________ I. Drought causes soil to crack Carbonation _________ J. Rounded pebbles in a stream bed Exfoliation _________ K. Lifted sections of sidewalk along tree lined streets Mechanical Weathering Chemical Weathering ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________