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Weathering Take two

Weathering Take two. Mr. Lewis. Vocab from last day (and an organizer!). Weathering – the breakdown of rock due to exposure to the atmosphere and elements Mechanical Weathering – When rock is broken down into smaller pieces (physical change)

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Weathering Take two

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  1. Weathering Take two Mr. Lewis

  2. Vocab from last day (and an organizer!) • Weathering – the breakdown of rock due to exposure to the atmosphere and elements • Mechanical Weathering – When rock is broken down into smaller pieces (physical change) • Chemical Weathering – When rock is dissolved or it’s chemical composition changed • Ice Wedging – Water in small cracks freezes, expands and forces rocks apart breaking it • Erosion – the transport of broken down rock and soil

  3. Chemical Weathering • Caused by rainwater, oxygen, carbon dioxide, and acids of plant decay • Hydrolysis – the chemical reaction of water and other substances • Oxidation – the chemical reaction of oxygen and other substances • Hydrolysis of carbon dioxide makes Carbonic Acid-This is why rain is normally acidic • Carbonic acid affects calcite the most causing it to dissolve completely (commonly makes underground caves)

  4. Rocks and Weathering Rocks which resist weathering Rocks which easily weather • Quarts does not react with water, oxygen or acids. • Quarts also doesn’t have cleavage so resists mechanical weathering • Feldspar • Hornblende • Augite • Calcite • Gypsum

  5. Climate and Weathering • Chemical weathering happens faster when the climate is warm and wet • Mechanical weathering happens faster when the climate is cold and dry • Surface area is also an important factor: • More surface area = faster weathering

  6. Weathering • When rocks of different weathering resistance are in the same place, neat landscapes can be made

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