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The document is a power point presentation about weathering submitted by Shibina Beegum N.R. It defines weathering as the disintegration or decomposition of rocks and identifies the three main types as physical/mechanical weathering, chemical weathering through reactions with oxygen, carbon dioxide and water, and biological weathering caused by plant roots and animal burrowing. It notes that weathering helps humans by extracting minerals for quarrying and mining, enabling construction works, and causing soil formation.
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This document discusses two main types of weathering - mechanical and chemical weathering. Mechanical weathering breaks rock down physically into smaller pieces without changing the chemical composition, such as through ice wedging, exfoliation, thermal expansion, and biotic processes. Chemical weathering breaks rock down through chemical reactions that alter the chemical composition of minerals, such as oxidation and carbonation which involve reactions with oxygen and carbon dioxide respectively. Both types of weathering are the first step in forming soil and sedimentary rock.
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Weathering is the breaking down of rocks into smaller particles that forms soil through physical, chemical, and biological processes. Physical weathering occurs due to temperature changes that cause rocks to crack and break apart, sometimes with the assistance of water. Chemical weathering involves chemicals in rain and water reacting with rocks and minerals to change or weaken them. Biological weathering is the weakening of rocks through interactions with plants, animals, and microbes. Common types of chemical weathering include acidification, oxidization, carbonation, and hydrolysis.
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The document discusses the two main types of weathering - chemical and mechanical. Chemical weathering involves changing the minerals in rocks through processes like acid etching and oxidation. Mechanical weathering breaks rocks into fragments without changing their chemical makeup, through processes like frost wedging and abrasion. Weathering breaks rocks down, while erosion involves their removal and transport by agents such as water, wind, waves and glaciers. The document provides examples of different geological processes and asks the reader to identify if they involve weathering, erosion, or both.
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This document discusses different types of weathering and mass movement. It describes weathering as the breaking down and decay of exposed rock at or near the Earth's surface. Weathering occurs through mechanical, chemical and biological processes. Mechanical weathering breaks rocks into smaller pieces without changing their chemical composition, through processes like thermal expansion and frost cracking. Chemical weathering alters the chemical composition of rocks through processes like oxidation and hydrolysis involving water and climate factors. Mass movement involves the downward and outward movement of rock and soil under the force of gravity, such as through rock falls, landslides, and talus slopes.
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This document discusses biological weathering, which is the breakdown of rocks and other materials caused by living organisms. It occurs through both mechanical and chemical means as organisms interact with rocks. The main causes of biological weathering are: 1) man and animals through activities like construction and burrowing; 2) higher plants and their roots, which can penetrate cracks and exert disruptive force; 3) microorganisms like bacteria, fungi, and mosses that extract nutrients and produce compounds aiding decomposition. An advantage is that biological weathering creates nutrient-rich soil allowing plant growth, though it can also cause rock instability.
Weathering and Erosion
The document discusses various types of weathering and erosion processes that break down and transport earth materials. It defines weathering as the chemical or mechanical breakdown of rocks due to weather exposure. The main types of weathering are mechanical, chemical, and biotic. Mechanical weathering breaks rocks into smaller pieces physically without composition change. Chemical weathering alters the mineral composition through processes like hydrolysis and oxidation. Biotic weathering involves living organisms. Erosion is then defined as the removal or transportation of eroded earth materials by agents like water, wind, ice, and gravity. The key erosional processes discussed are water erosion, wind erosion, glacial erosion, sea erosion, and soil erosion.
Welcome power
Mechanical, chemical, and biological weathering break rocks into small pieces. Mechanical weathering occurs when temperature changes cause rocks to expand and contract, cracking them. Chemical weathering happens when gases in rainwater dissolve minerals in rocks. Biological weathering is carried out by roots, burrowing animals, and humans breaking rocks apart. All rocks on Earth will eventually weather due to these exogenic forces.
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Mechanical and chemical weathering break rocks down into sediments and soil. Mechanical weathering involves physical breakdown through forces like frost wedging when water freezes in cracks. Chemical weathering changes the rocks' composition through acids. Weathering is important for producing soil but excessive erosion from agents like water and wind can harm the environment if not prevented through measures like planting vegetation.
Weathering
Physical weathering breaks down rock through mechanical means such as water, wind, heat and freezing. Chemical weathering decomposes and dissolves rock through chemical reactions, such as acid rain interacting with rock surfaces. Biological weathering is caused by living organisms like plants and burrowing animals that contribute to both mechanical and chemical weathering through processes like wedging cracks open and allowing water penetration into rock.
Weathering
Physical weathering breaks down rock through mechanical means such as water, wind, heat and freezing. Chemical weathering decomposes and dissolves rock through chemical reactions, such as acid rain interacting with rock surfaces. Biological weathering is caused by living organisms like plants and burrowing animals that contribute to both mechanical and chemical weathering through processes like wedging cracks open and allowing water penetration into rock.
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Power point presentation
- 1. POWER POINT PRESENTATION Submitted by, Shibina Beegum N.R. Social Science Date: 4/08/2015 Tuesday
- 2. WELCOME
- 3. WEATHERING Disintegration or decomposition of rocks is known as Weathering.
- 4. TYPES OF WEATHERING Physical / Mechanical Weathering Chemical Weathering. Biological Weathering.
- 5. PHYSICAL / MECHANICAL WEATHERING
- 6. CHEMICAL WEATHERING Oxygen, Carbon dioxide, Water etc….react with the minerals and result in the Chemical de composition of rocks
- 7. BIOLOGICAL WEATHERING The plant roots penetrating into the fissures in rocks, burrowing of animals and the decomposition of plant and animal remains leads to biological weathering.
- 9. Quarriying Mining Constructive works Deforestation
- 10. WEATHERING HELPS HUMANS IN MANY WAYS Minerals in rocks get extracted. Helps in mining. Causes soil formation.
- 11. THANK YOU