Topic 4: Weathering, Erosion and Deposition

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Weathering and Erosion

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Presentation transcript:

Topic 4: Weathering, Erosion and Deposition

Erosion

deposition

Part 1: Weathering Weathering: The breakdown of rocks, either chemically or physically.

The breakdown of rock into smaller pieces Physical weathering Physical Weathering: The breakdown of rock into smaller pieces Dominant type of Weathering in Cold, Damp climates

Examples of physical weathering 1. Frost Action At temperatures below freezing, water trapped in cracks expands, enlarging cracks, eventually breaking rocks. Many cycles of freezing and thawing will cause rock to crumble

Examples of physical weathering 2: Plant Action: Roots of plants grow into cracks, widening cracks and eventually breaking rock apart.

Examples of physical weathering 2: Plant Action Often begins with lichens

Examples of physical weathering 3: Pressure Unloading: Earthquakes, erosion, and landslides cause overlying material to be removed from rock, allowing the rock to split along lines of weakness.

Examples of physical weathering Pressure Unloading

Chemical Weathering Chemical Weathering: The breakdown of rock by changing the minerals the rock is made of. The chemical composition of the rock is changed. Dominant type of weathering in warm and moist climates.

Chemical Weathering

Chemical Weathering Oxidation: Chemical weathering where oxygen from the air combines with elements to form new compounds. Example: Rust = Iron + Oxygen

Chemical Weathering Carbonation: Carbon dioxide combines with WATER to form Carbonic Acid. This acid easily dissolves limestone and marble. This is how caves and sinkholes form.

Chemical Weathering

Chemical Weathering

Water is a major agent in both physical and chemical weathering .