Presentation Transcript
Weathering and Erosion: Weathering and Erosion
Weathering: Weathering The breakdown do the materials of Earth’s crust into smaller pieces.
Physical Weathering: Physical Weathering Process by which rocks are broken down into smaller pieces by external conditions.
Types of Physical weathering
Frost heaving and Frost wedging
Plant roots
Friction and impact
Burrowing of animals
Temperature changes
Frost Wedging: Frost Wedging
Frost Heaving: Frost Heaving
Plant Roots: Plant Roots
Friction and Repeated Impact: Friction and Repeated Impact
Burrowing of Animals: Burrowing of Animals
Temperature Changes: Temperature Changes
Chemical Weathering: Chemical Weathering The process that breaks down rock through chemical changes.
The agents of chemical weathering
Water
Oxygen
Carbon dioxide
Living organisms
Acid rain
Water: Water Water weathers rock by dissolving it
Oxygen: Oxygen Iron combines with oxygen in the presence of water in a processes called oxidation
The product of oxidation is rust
Carbon Dioxide: Carbon Dioxide CO2 dissolves in rain water and creates carbonic acid
Carbonic acid easily weathers limestone and marble
Living Organisms: Living Organisms Lichens that grow on rocks produce weak acids that chemically weather rock
Acid Rain: Acid Rain Compounds from burning coal, oil and gas react chemically with water forming acids.
Acid rain causes very rapid chemical weathering
Karst Topography: Karst Topography A type of landscape in rainy regions where there is limestone near the surface, characterized by caves, sinkholes, and disappearing streams.
Created by chemical weathering of limestone
Features of Karst: Sinkholes: Features of Karst: Sinkholes
Features of Karst: Caves: Features of Karst: Caves
Features of Karst: Disappearing Streams: Features of Karst: Disappearing Streams
Erosion: Erosion The process by which water, ice, wind or gravity moves fragments of rock and soil.
Water Erosion: Water Erosion Rivers, streams, and runoff
Ice Erosion: Ice Erosion Glaciers
Wind Erosion: Wind Erosion
Mass Movements: Mass Movements Landslides, mudslides, slump and creep landslide clip.mpeg