weathering and erosion. student expectation analyze the effects of weathering, erosion, and...
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![Page 1: Weathering and Erosion. Student Expectation Analyze the effects of weathering, erosion, and deposition on the environment in ecoregions of Texas](https://reader036.vdocuments.net/reader036/viewer/2022062422/56649f335503460f94c508dc/html5/thumbnails/1.jpg)
Weathering and Erosion
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Student Expectation
• Analyze the effects of weathering, erosion, and deposition on the environment in ecoregions of Texas.
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Weathering
• The breakdown of the materials of Earth’s crust into smaller and smaller pieces.
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Physical Weathering
• Process by which rocks are broken down into smaller pieces by external conditions.
• Types of Physical weathering– Frost heaving and ice wedging– Plant roots– Friction and impact– Burrowing of animals– Temperature changes
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Ice Wedging
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Frost Heaving
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Plant Roots
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Friction and Repeated Impact
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Burrowing of Animals
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Temperature Changes
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Chemical Weathering
• The process that breaks down rock through chemical changes.
• The agents of chemical weathering– Water– Oxygen– Carbon dioxide– Living organisms– Acid rain
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Water
• Water weathers rock by dissolving it
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Oxygen• Iron combines with
oxygen in the presence of water in a processes called oxidation
• The product of oxidation is rust
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Carbon Dioxide
• CO2 dissolves in rain water and creates carbonic acid
• Carbonic acid easily weathers limestone and marble
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Living Organisms
• Lichens that grow on rocks produce weak acids that chemically weather rock
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Acid Rain• Compounds from burning coal, oil and gas
react chemically with water forming acids.
• Acid rain causes very rapid chemical weathering
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Features of Karst: Sinkholes
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Features of Karst: Caves
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Erosion
• The process by which water, ice, wind or gravity moves fragments of rock and soil.
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Water Erosion
• Rivers, streams, and runoff
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Ice Erosion
• Glaciers
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Wind Erosion
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Mass Movements
• Landslides, mudslides, slump and creep
landslide clip.mpeg
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Deposition
• The dropping of sediment when an agent of erosion, such as gravity, a glacier, wind, or water, loses its energy– Horizontal sorting – the sediments that were
once carried down the stream are dropped off from largest to smallest.
– Graded bedding – the smallest sediments are also dropped to the bottom last
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Horizontal Sorting
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Graded Bedding
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Deltas form as a result