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Types of Weathering Kim Bennison Katy Hogan Alex Gage Kelly Fischer
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Mechanical/Physical Weathering Exfoliation Ice Wedging Organic Wedging Abrasion
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Exfoliation When a rock has heat exerted upon it, along with pressure, it separates into layers.
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Ice Wedging When water leaks into the cracks of rocks, it freezes and causes the rock to crack.
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Organic Activity This occurs when burrowing animals, humans, or plants interfere and work their way into rocks.
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Abrasion Abrasion occurs when rocks rub against eachother and become rounded.
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Chemical Weathering Hydrolysis Oxidation Dissolution Acid –Carbonation –Precipitation –Plant Acid
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Hydrolysis When rocks sit in water for extended periods of time they begin to break down and have a clay-like texture.
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Oxidation When oxygen reacts with iron in rocks, they rust, taking on a red-orange color.
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Dissolution Rocks, when in water, react with acids in the water and dissolve. A clue that this has happened to a rock is the presence of small holes.
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Acid 1 Carbonation- water absorbs carbon dioxide when rain falls or from decaying organic material. The carbon dioxide dissolved in water forms carbonic acid that reacts with many common minerals.
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Acid 2 Precipitation- Water in the atmosphere absorbs sulfur oxides and nitrogen oxides. Through a series of chemical reactions these pollutants are converted into acids that are a cause of acid precipitation.
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Acid 3 Plant Acid- When plants decay they release acids that react with the minerals in rocks.
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