W,E,Dep.ppt - Weathering Erosion Deposition and Landsc...

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Mrs. Degl 1 Weathering, Erosion, Deposition, and Landsc Weathering – the breakdown of rocks into smaller pieces, called sediments. Erosion – the process where the sediments are transported by wind, gravity, glaciers, man, and running water. Deposition – the process whereby these sediments are released by their transporting agents (dropped). Weathering breaks down the rocks, erosion moves the particles, and deposition drops the sediments in another location.
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Mrs. Degl 2 There are two primary types of weathering : Chemical and Physical 1. Physical Weathering – the breakdown of rocks and minerals into smaller pieces without a change in chemical composition. Root/Plant Wedging/Action Ice/Frost Wedging/Action Exfoliation and Abrasion are also types of physical weathering.
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Mrs. Degl 3 2. Chemical Weathering – the breakdown of rocks and minerals into smaller pieces by chemical action. The rocks breaks down at the same time as it changes chemical composition. The end result is different from the original rock. There are 3 types of chemical weathering: 1. Oxidation – oxygen combines with the elements in the rock and it reacts. This the scientific name for rust. 2. Hydration – water can dissolve away many earth materials, including certain rocks. 3. Carbonation – carbon dioxide dissolves in water to form carbonic acid. This makes acid rain which chemically weathers (dissolves) rocks. Other acids also combine with water to make acid rain.
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Mrs. Degl 4 2. Particle Size – Larger particles weather slower and smaller particles weather at a faster rate. There are 4 factors that effect the rate of weathering: 1. Surface Area (exposure) - Exposing more surface area will increase the rate of weathering. 3. Chemical Composition (what a rock is made of) – Certain rocks and minerals are naturally weaker than others, while others are more resistant (stronger). 4 . Climate – Warmer, moister climates have the most weathering. Heat & Water speed up all chemical reactions. This is the most important factor in weathering.
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Mrs. Degl 5 Soil forms from the weathering of the rock below it. The solid rock below is called Bedrock . The rock is exposed to wind, rain etc… The rock breaks down over time to form soil. Soil has different layers called Soil Horizons. O- Horizon = the very thin surface covering (not really a layer) A – Horizon (TOPSOIL) = dark surface soil that contains a lot of living material and dead plant/animal remains (humus). This is the layer with all of the nutrients needed to grow plants.
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  • Winter '17
  • Jacob Clifford
  • Erosion, Sediment, Mrs. Degl

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