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what are six agents of physical weathering
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Physical (mechanical) weathering breaks rock into smaller pieces without changing its chemical composition. Six common agents/processes:
- Freeze–thaw (frost wedging): Water enters cracks, freezes, expands (~9%), and widens fractures over repeated cycles.
- Thermal expansion/insolation: Repeated heating and cooling cause minerals or outer rock layers to expand and contract, leading to cracking and flaking.
- Salt-crystal growth (haloclasty): Evaporation leaves salts in pores; salt crystals grow and exert pressure that breaks the rock (common in deserts and coastlines).
- Abrasion: Particles carried by wind, water, or ice scrape and grind rock surfaces, wearing them down.
- Pressure release / unloading (exfoliation): Removal of overlying material reduces confining pressure, allowing outer rock layers to peel off in sheets (typical in exposed plutons like granite).
- Biological activity: Plant roots, burrowing animals, and human activity force rocks apart mechanically.
If you want, I can give specific examples or show where each is most active (mountains, deserts, coasts, glacial areas, etc.).
- Freeze–thaw (frost wedging): Water enters cracks, freezes, expands (~9%), and widens fractures over repeated cycles.
- Thermal expansion/insolation: Repeated heating and cooling cause minerals or outer rock layers to expand and contract, leading to cracking and flaking.
- Salt-crystal growth (haloclasty): Evaporation leaves salts in pores; salt crystals grow and exert pressure that breaks the rock (common in deserts and coastlines).
- Abrasion: Particles carried by wind, water, or ice scrape and grind rock surfaces, wearing them down.
- Pressure release / unloading (exfoliation): Removal of overlying material reduces confining pressure, allowing outer rock layers to peel off in sheets (typical in exposed plutons like granite).
- Biological activity: Plant roots, burrowing animals, and human activity force rocks apart mechanically.
If you want, I can give specific examples or show where each is most active (mountains, deserts, coasts, glacial areas, etc.).
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