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Ch. 9 Study Sheet - Allen County Schools
Ch. 9 Study Sheet - Allen County Schools

... Unit B Chapter 9 Study Sheet Landform- natural feature on Earth’s surface such as mountains, hills, valleys, plains, plateaus, and coastal features. Peninsulas are landforms that are always found on the coast. Weathering causes the Earth’s surface to change constantly. Weathering- rocks being broken ...
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科目名 Course Title Geotechnical Measurement Engineering [地盤

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... 2. hot (dry)  more mechanical weathering (heat helps break bonds) B. Organisms—burrow and churn up the surface exposing unweathered minerals to the atmosphere C. Time: more time = more weathering D. Composition of minerals: some minerals more resistant to weathering than others ...
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... liquids. P waves slow down and bend when they hit the liquid outer core. 33. S waves do not travel through liquids. 34. Weathering is the process that rocks are broken down by water, air, and organisms. 35. Chemical Weathering occurs in warm, humid climates. 36. Mechanical Weathering occurs in cold ...
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Weathering



Weathering is the breaking down of rocks, soil and minerals as well as artificial materials through contact with the Earth's atmosphere, biota and waters. Weathering occurs in situ, roughly translated to: ""with no movement"" , and thus should not be confused with erosion, which involves the movement of rocks and minerals by agents such as water, ice, snow, wind, waves and gravity and then being transported and deposited in other locations.Two important classifications of weathering processes exist – physical and chemical weathering; each sometimes involves a biological component. Mechanical or physical weathering involves the breakdown of rocks and soils through direct contact with atmospheric conditions, such as heat, water, ice and pressure. The second classification, chemical weathering, involves the direct effect of atmospheric chemicals or biologically produced chemicals also known as biological weathering in the breakdown of rocks, soils and minerals. While physical weathering is accentuated in very cold or very dry environments, chemical reactions are most intense where the climate is wet and hot. However, both types of weathering occur together, and each tends to accelerate the other. For example, physical abrasion (rubbing together) decreases the size of particles and therefore increases their surface area, making them more susceptible to rapid chemical reactions. The various agents act in concert to convert primary minerals (feldspars and micas) to secondary minerals (clays and carbonates) and release plant nutrient elements in soluble forms.The materials left over after the rock breaks down combined with organic material creates soil. The mineral content of the soil is determined by the parent material, thus a soil derived from a single rock type can often be deficient in one or more minerals for good fertility, while a soil weathered from a mix of rock types (as in glacial, aeolian or alluvial sediments) often makes more fertile soil. In addition, many of Earth's landforms and landscapes are the result of weathering processes combined with erosion and re-deposition.
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