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Worksheet about Physical Weathering | ||
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| Subject: Physics | ||
| 9th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 305KB | ||
| Number of clicks: 98 | ||
| Publish date:November 09, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-08-24 13:54:17 | ||
| Updated by: Eman9966 on 2023-11-09 10:36:30 | By: theodor Diosdado Corrales | |
File info: Physical weathering, also known as mechanical weathering, refers to the breakdown and fragmentation of rocks and other geological materials through physical processes. Unlike chemical weathering, which involves the alteration of materials through chemical reactions, physical weathering does not change the chemical composition of the substances involved. Physical weathering occurs as a result of various natural forces and processes. These include:1. Frost Wedging: When water seeps into cracks or pores in rocks and freezes, it expands, exerting pressure and causing the rock to break apart. 2. Thermal Expansion and Contraction: Daily temperature fluctuations cause rocks to expand when heated and contract when cooled, leading to stress and eventual fracturing. 3. Exfoliation: This process involves the gradual peeling away of outer layers of rocks due to the release of pressure caused by erosion or the removal of overlying materials. 4. Abrasion: The mechanical wearing down of rocks occurs when they are subjected to friction and rubbing against each other, as well as by the action of wind, water, or ice carrying abrasive particles. 5. Biological Activity: Plant roots, burrowing animals, and other organisms exert pressure on rocks, causing them to crack and break apart. 6. Salt Crystal Growth: In areas with high salt content, salt crystals can form within the rock's pores. As these crystals grow, they exert pressure on the surrounding material, leading to its disintegration. Physical weathering plays a significant role in shaping landscapes and contributing to the formation of soil. By breaking down rocks into smaller fragments, it increases the surface area available for chemical weathering processes to act upon. Over time, the combined effects of physical and chemical weathering lead to the gradual erosion and transformation of geological features. | ||
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