Weathering and Erosion (Meteorización [desgaste] y Erosión)
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Transcript of Weathering and Erosion (Meteorización [desgaste] y Erosión)
![Page 1: Weathering and Erosion (Meteorización [desgaste] y Erosión)](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649d305503460f94a090d9/html5/thumbnails/1.jpg)
Weathering and Erosion(Meteorización [desgaste] y Erosión)
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Weathering
• The breakdown of the materials of Earth’s crust into 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 Frost wedging (Gelifracción)– Plant roots (raíces de plantas)– Friction and impact (Fricción e impacto)– Burrowing of animals (Animales cavando cuevas)– Temperature changes (Cambios de temperatura)
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Frost 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 (Agua)– Oxygen (Oxígeno)– Carbon dioxide (Dióxido de Carbono)– Living organisms (Organismos vivos)– Acid rain (Lluvia ácida)
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Water• Water weathers rock by dissolving it
(El agua meteoriza la roca disolviendola).
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Oxygen• Iron (hierro) combines
with oxygen (oxígeno) in the presence of water in a processes called oxidation (oxidación)
• The product of oxidation is rust (moho)
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Carbon Dioxide
• CO2 dissolves in rain water and creates carbonic acid (Acido carbónico)
• Carbonic acid easily weathers limestone (arenizca) and marble (mármol)
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Living Organisms• Lichens (líquenes) 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 (lluvia ácida) causes very rapid chemical weathering
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Karst Topography• A type of landscape in rainy regions where
there is limestone near the surface, characterized by caves (cuevas), sinkholes (sumideros), and disappearing streams (ríos subterráneos).
• Created by chemical weathering of limestone
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Features of Karst: Sinkholes
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Features of Karst: Caves
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Features of Karst: Disappearing Streams
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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 (Glaciares)
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Wind Erosion
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Mass Movements
• Landslides, mudslides, slump and creep
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