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Weathering, Erosion, & Deposition: Transforming Earth's Surface

Learn how weathering breaks down rocks, erosion moves the Earth, and deposition builds new landforms. Discover the processes, types, and effects of physical and chemical weathering, erosion by water, wind, gravity and ice, as well as the formation of deltas, mountains, sand dunes, and plateaus.

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Weathering, Erosion, & Deposition: Transforming Earth's Surface

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  1. How does weathering, erosion, & deposition act in a cycle to change the Earth’s surface? Weathering Erosion Deposition - moves the Earth – drops off, to build the Earth -breaks down the Earth

  2. What is Weathering? • The breaking down of rocks into smaller pieces • Must occur before erosion can happen • No movement is involved • Two types: Mechanical & Chemical • Sediments- small/tiny pieces of weathered down rock.

  3. What is Physical Weathering? Palo Duro Canyon in the High Plains Eco-Region Physical Weathering -- The steep walls here were carved out by moving water • Physical/Mechanical weathering … the breaking down of rocks into smaller pieces with out changing the material

  4. Physical Weathering 1. Animal burrowing 2. Plant Roots 3. Ice Wedging 4. Abrasion Enchanted Rock in the Llano Uplift Eco-region 5. Exfoliation-warming and cooling of rocks over time causes rocks to peel into sheets

  5. What is Chemical Weathering? 3. This cave was formed by slightly acidic water dissolving the limestone (carbonic acids) • Chemical weathering … dissolving and changing the minerals in rocks into new ones. 1. Oxidation-Rusting 2. Plant Acids

  6. What is Erosion? • The movement of weathered earth materials by moving water, wind, gravity or ice (glaciers)

  7. How does removing plants effect the erosion on the left side of the hill? Draw and answer the question

  8. What is Deposition? • Delta • Mountains • Sand Dunes • Plateau Before After • When eroded sediments are deposited in a new location • Example: delta -- where sediment is deposited where a river flows into an ocean or lake builds up a landform

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