Presentation on theme: "Weathering, Erosion, & Deposition"— Presentation transcript:
1Weathering, Erosion, & Deposition What are the effects of weathering, erosion, and deposition on the environment in Texas Eco-regions?
2How does weathering, erosion, & deposition act together in a cycle that changes the Earth’s surface? Weathering-breaks down the Earth’s surfaceErosion - moves the Earth’s surface (diminishes the surface)Deposition – drops off sediments to build up the earth’s surfacefc2.galenaparkisd.com
4What is Weathering? Must occur before erosion can happen The breaking down of rocks into smaller piecesMust occur before erosion can happenNo movement is involvedTwo types: Mechanical & ChemicalSediments- small/tiny pieces of weathered down rock.
5What is Physical Weathering? Physical/Mechanical weathering …the breaking down of rocks into smaller pieces with out changing what the materialPhysical Weathering -- The steep walls here were carved out by moving waterPalo Duro Canyon in the High Plains Eco-Region
6Enchanted Rock in the Llano Uplift Eco-region Physical Weathering1. Animal burrowing2. Plant Roots3. Ice Wedging4. AbrasionEnchanted Rock in the Llano Uplift Eco-region5. Exfoliation-warming and coolingof rocks over time causes rocksto peel into sheets
7What is Chemical Weathering? dissolving and changing the minerals in rocks into new ones.1. Oxidation-Rusting2. Plant Acids3. This cave was formed by slightly acidic water dissolving the limestone (carbonic acids)
8Chemical WeatheringNatural Bridge Caverns in Texas
9What is Erosion? Water Wind Water & Gravity Gravity Example The movement of weathered earth materials by moving water, wind, gravity or ice (glaciers)ExampleCause of ErosionWaves eroding the beach and East TX shorelineWaterDesert Sandstorm in West TX from droughtWindRain causing Mudslide in the Rolling Hills of Central TXWater & GravityLandslide on sides of Plateaus of Central TXGravityRain carrying soil down a driveway
11How does removing plants effect the erosion on the left side of the hill?
12How does keeping plants effect the erosion on the right side of the hill? Mudslide dangerLoss of topsoilClogged storm drainsFlooding problemsExpensive clean upEroded or buriedhouse foundations
13How vegetation affects erosion.. No/Less vegetationVegetationSoil in placeLess clean upMinimum erosionProtectionfor housefoundationsMudslide dangerLoss of topsoilClogged storm drainsFlooding problemsExpensive clean upEroded or buriedhouse foundations
14What is Deposition? Before After DeltaMountainsSand DunesPlateauWhen eroded sediments are deposited in a new locationExample: delta -- where sediment is deposited wherea river flows into an ocean or lake builds up a landformBefore After
15Deposition W. Texas Example Desert winds sculpted these gentle swirls out of the limestone hills in Black Gap Wildlife Management Area, Texas. This remote, 100,000-acre area in West Texas contains some ofthe lowest, driest, andhottest areas in theChihuahuan Desert
16Deposition Deposition area from the Rio Grande River The Red River carries sediments, and drops some along the way
17Let’s Practice, write in your S. J Let’s Practice, write in your S.J. what type of erosion shaped these landforms!Water, Wind, Gravity, Ice?