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ROCKS AND MINERALS STUDY GUIDE Classification of Rocks
ROCKS AND MINERALS STUDY GUIDE Classification of Rocks

... Ways Rocks Break Down 1. Weathering is the process of breaking rocks into smaller pieces. a. Example: Smashing a rock with a hammer. 2. When water freezes in a rock it expands and slowly breaks a rock apart. Charcoal briquette experiment. 3. Rocks in rivers break down because the water bumps them to ...
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... millipedes and woodlice. They break down dead organic matter that can be further digested by decomposers. the natural nutrient enrichment of a water body. It can be accelerated by human actions such as the release of sewage effluent or the use of fertilisers that are leached into water bodies. a the ...
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... Sedimentary Rocks • 95% of the Earth’s volume is igneous and metamorphic rocks but 75% of the Earth’s surface is covered by sediments or sedimentary rocks. • Derived from pre-existing rocks: – 1. detrital/clastic rocks: mineral grains or rock fragments (mechanical or biological weathering) – 2. che ...
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word doc leoce study guide with answers

... Erosion is: Movement of sediments, rocks, silt, or soil. Waves affect shorelines by: Waves break down shoreline rocks and move sand parallel to the beachline. 26. Describe how weathering/erosion/deposition create deltas, sinkholes, canyon, dunes, and alluvial fans. Delta: eroded material is carried ...
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Fall Semester Review Questions 1. What is the disadvantage of a

... the sea due to physical weathering, but they erode away due to chemical weathering. B. A rock with iron in it is exposed to air and crumbles because of physical weathering, but the same rock crushed by a larger rock breaks apart due to chemical weathering. C. Minerals in water wear away at rock beca ...
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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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