Weathering Chapter 5.1.

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Presentation transcript:

Weathering Chapter 5.1

Weathering Definition A constant process of breaking down objects on the Earth’s surface

Mechanical Weathering Breaking rock into smaller and smaller pieces. It DOES NOT change the rock…it just changes the size!!

4 Types of Mechanincal Weathering

Abrasion Physical grinding of rock fragments Think of sandpaper

Frost Wedging Water fills in cracks in rock, freezes and expands, causing the rocks to break apart

Organic Activity Plants grow in the cracks of rocks and their roots cause them to break

Thermal Expansion Warming causes the rock to expand. When it cools, it contracts and breaks.

Changing the rocks chemical composition or chemical make up. Chemical Weathering Changing the rocks chemical composition or chemical make up.

4 Types of Chemical Weathering

Oxidation Iron + Oxygen = Rust

Carbonation Carbon Dioxide + Water = Carbonic Acid Gets into the soil and dissolves the rocks underneath

Sulfur oxides + Rain = Acid Rain Sulfuric Acid Sulfur oxides + Rain = Acid Rain AFTER BEFORE

Hydrolysis Water can dissolve minerals or form new minerals Water + Feldspar = Clay

Factors that Affect the Rate of Weathering

Composition of the Rock The harder the rock, the slower it will weather Ex. Sandstone is easily weathered Moh’s Scale – 3.5

The more moisture, the faster the rocks weather Climate The more moisture, the faster the rocks weather

Surface Area The amount of the rock exposed to the environment