Aya Alygeo chapter 6

Aya Alygeo chapter 6 - Professor Ohan Chapter 6 1-...

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Professor Ohan Chapter 6 1- Weathering is the breaking down of Earth's rocks , soils and minerals through direct contact with the planet's atmosphere . Weathering occurs in situ, or "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, wind, and gravity.In addition, weathering is the effect of atmospheric exposure to man-made structures and materials. 2- Two important classifications of weathering processes exist — physical and chemical weathering. 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. 3- 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 . 4- Physical weathering is the class of processes that causes the disintegration of rocks without chemical change.The primary process in physical weathering is abrasion (the process by which clasts and other particles are reduced in size). However, chemical and physical weathering often goes hand in hand. For example, cracks exploited by physical
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This note was uploaded on 02/05/2012 for the course GEOLOGY 101-101 taught by Professor Ohan during the Spring '11 term at CUNY City.

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Aya Alygeo chapter 6 - Professor Ohan Chapter 6 1-...

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