Rock Cycle Unit 3 – What is weathering

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Presentation transcript:

Rock Cycle Unit 3 – 2. 1. 3 What is weathering Rock Cycle Unit 3 – 2.1.3 What is weathering? Explain how weathering can lead to soil formation.

Weathering Chapter 7 – Pg.152--

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

Mechanical Weathering Breaking rock into smaller and smaller pieces.

1. Abrasion - physical grinding of rock fragments

2. Frost Wedging Water expands when frozen in cracks of rocks causing them to break.

3. Organic Activity- plants grow through rocks and cause them to break.

4. Thermal Expansion Warming causes the rock to expand and when it is cooled it contracts and breaks.

Chemical Weathering Changes in the mineral composition or chemical make up.

1. Oxidation – Iron + Oxygen = Rust

Gets into the soil dissolves the rocks beneath. 2. Carbonation Carbon Dioxide + Water = Carbonic Acid Gets into the soil dissolves the rocks beneath.

3. Sulfuric Acid Sulfur oxides + Rain = Acid Rain

4. Hydrolysis Water + feldspar = clay Water can dissolve minerals or form a new mineral.

Factors that Affect the Rate of Weathering

1. Composition of the Rock Example - Sandstone is easily weathered. Rocks that resist weathering are called stable rocks Ex: Granite (most common igneous rock) Sandstone Swirl – Arizona

2. Climate The more moisture the faster the rocks weather.

3. The Amount of the Rock Exposed to the Surface

Weathering Animation http://www.brainpop.com/science/weather/weathering/ Brain pop http://www.glencoe.com/sites/common_assets/science/virtual_labs/E06/E06.html