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Weathering and Erosion

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on 13 December 2017

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Transcript of Weathering and Erosion

Two types of weathering
Types of mechanical weathering
Mechanical Weathering
Physical Change (ex. size or shape)
Weathering Vs Erosion
Weathering Erosion
Mechanical or Chemical?
Weathering and Erosion
EQ: How does Weathering and Erosion break down rock?
Chemical weathering
Change is composition
Weathering
Break down of rock into sediments
Erosion
Movement of sediments
Water
Ice
Wind
Gravity
Ice Wedging
- Water expands when it is frozen
Exfoliation
- Cracking or peeling
Abrasion -
rubbing (sandpaper) (makes the rocks smooth)
Organic activity -
ex. animals digging or plants roots
types of Chemical weathering
Hydrolysis -
Caused by water
Oxidation -
caused by oxygen
- affects metal (ex. Iron)
- causes rust (red color)
Leaching -
caused by acid
- affects limestone
-causes caves and
sinkholes
Examples of erosion
Forces of weathering and erosion
rock split by ice
Rusted bike chain
Marble statue weathered by acid
Rocks smoothed by running water
Animals digging in the soil
Soil Creep -
Slow movement of soil downhill
Mass movement
Mudslide
Rock slide
Landslide
Rate of weathering
Time
more time = more weathering & erosion
Surface Area
more surface area = faster weathering & Erosion
Composition
Climate
Warm = faster
Cold = slower
Humid (wet) = faster
Dry = slower
Low surface area
High surface area
Full transcript