Presentation on theme: "What are the effects of weathering, erosion, and deposition on the environment in Texas Eco-regions? Weathering, Erosion, & Deposition."— Presentation transcript:
What are the effects of weathering, erosion, and deposition on the environment in Texas Eco-regions? Weathering, Erosion, & Deposition
Weathering-breaks down the Earth’s surface Erosion - moves the Earth’s surface (diminishes the surface) Deposition – drops off sediments to build up the earth’s surface fc2.galenaparkisd.com How does weathering, erosion, & deposition act together in a cycle that changes the Earth’s surface?
Please draw the cycle Weathering Erosion Deposition
Must occur before erosion can happen No movement is involved Two types: Mechanical & Chemical Sediments- small/tiny pieces of weathered down rock. The breaking down of rocks into smaller pieces What is Weathering?
Physical/Mechanical weathering … the breaking down of rocks into smaller pieces with out changing what the material Physical Weathering -- The steep walls here were carved out by moving water Palo Duro Canyon in the High Plains Eco-Region What is Physical Weathering?
Enchanted Rock in the Llano Uplift Eco-region 5. Exfoliation-warming and cooling of rocks over time causes rocks to peel into sheets Physical Weathering 1. Animal burrowing 2. Plant Roots 3. Ice Wedging 4. Abrasion
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 What is Chemical Weathering?
Natural Bridge Caverns in Texas Chemical Weathering
ExampleCause of Erosion Waves eroding the beach and East TX shoreline Water Desert Sandstorm in West TX from drought Wind Rain causing Mudslide in the Rolling Hills of Central TX Water & Gravity Landslide on sides of Plateaus of Central TX Gravity Rain carrying soil down a driveway Water & Gravity The movement of weathered earth materials by moving water, wind, gravity or ice (glaciers) What is Erosion?
Erosion Galveston Before and After Hurricane Ike
How does removing plants effect the erosion on the left side of the hill?
Mudslide danger Loss of topsoil Clogged storm drains Flooding problems Expensive clean up Eroded or buried house foundations How does keeping plants effect the erosion on the right side of the hill?
Mudslide danger Loss of topsoil Clogged storm drains Flooding problems Expensive clean up Eroded or buried house foundations Soil in place Less clean up Minimum erosion Protection for house foundations How vegetation affects erosion.. No/Less vegetation Vegetation
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 Before After What is Deposition? 1.Delta 2.Mountains 3.Sand Dunes 4.Plateau
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 of the lowest, driest, and hottest areas in the Chihuahuan Desert Deposition
Deposition area from the Rio Grande River The Red River carries sediments, and drops some along the way Deposition
Let’s Practice, write in your S.J. what type of erosion shaped these landforms! Water, Wind, Gravity, Ice?