Lecture 10 Soil.ppt - Lecture-10 Soil Course Instructor Md...

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Lecture-10: Soil Course Instructor: Md Asif Rahman (ASR) Lecturer, Department of Mathematics and Natural Sciences (MNS) University Building 2 (15 th Floor) E-mail: [email protected]
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Weathering of Rocks and Minerals Weathering refers to the physical, chemical and biological factors/processes that disintegrate ভভঙভ and decompose rocks and the minerals contained in them, at or near the earth’s surface, into separate solid particles and dissolved দববভ ভ ত materials . ( Weathering is the alteration or break-down of rocks and minerals near or at the surface of the earth. Weathering relates to changes of rock in place ) Physical weathering breaks rocks into small mineral particles. Chemical weathering changes and dissolves দববভ ভ ত minerals at the Earth’s surface. Biological weathering occurs by biological agents like microorganisms, plant roots etc which can cause the breakdown or bind the particles together .
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Erosion ক্ষয Erosion is the process by which soil and rock are removed from the Earth's surface by natural processes such as wind or water fow, and then transported and deposited in other locations.
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Soil: Definition Solid earth material that has been altered by physical, chemical and biological processes so that it can support rooted plant life. Engineering definition: Anything that can be removed without blasting The five main ingredients in all soils: 1.Minerals 45% 2.Organic compounds জজৈব যযযৌগ 5% 3.Living organisms
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5 Factors of Soil Formation 1. Parent Material 2. Climate 3. Topography 4. Organisms 5. Time
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