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Unformatted text preview: Geol 101 Weathering and Soils 18/10/2007 13:35:00 ← Weathering • Chemical and mechanical breakdown of rock • Erosion – Removal (not the same) • Energy from the sun ← Weathering Profile • Fig 14.2 ← Mechanical Weathering • Rocks are broken into progressively smaller pieces • Tectonic Forces – Fractures • Uplift o Fractures open o Air, Water, Biota • Erosion • Mechanical Breakup increases surface area and surface to volume ratio o The smaller the particle is the larger the surface area and volume will be • Pressure Release o Rocks formed deep, then brought to surface, will fracture • Thermal Expansion o Daily (up to 80 degrees c) and yearly cycles of heating and cooling • Salt Crystal Growth (evaporation) o Cavernous weathering from salt crystal growth o Fig 5.3 • Plant Wedging o Plant roots slowly push rocks apart o Fig 5.2 • Frost Wedging o Ice is less dense than water (expands when freezes)...
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- Fall '08
- salt crystal growth, Fireweathering Rock, sun Weathering Profile, Chemical Weathering Pathways