weathering and erosion
TRANSCRIPT
How does the earth change?
Water and Ice
weathering
Mechanical Weathering:
Water and Ice
Frost Wedging
Lima Beans – Mechanical Weathering
Physically Broken
Mechanical Weathering
Plant Roots
Mechanical Weathering
• Old Man of the Mountains
Chemical weathering
• Rocks break down through Chemical Changes:• Changing rocks• Can be done by:
– Water– Oxygen– Carbon Dioxide– Acid RainChemical Weathering CHANGES rocks permanently!
Water• Water weathers rock by dissolving it
Oxygen• Iron combines with
oxygen in the water (oxidation)
• The product of oxidation is rust
Carbon Dioxide
• CO2 dissolves in rain water and creates carbonic acid
• Carbonic acid easily weathers limestone and marble
Living Organisms
• Lichens that grow on rocks produce weak acids that chemically weather rock
Limestone near the surface
Chemical Erosion
• breaks down rocks one atom at a time
• dissolves or changes minerals • minerals carried away in water
Agent Erosion
Agent Erosion
Wind Erosion
Mass Movements
• Landslides, mudslides