Weathering, Mass Wasting, in addition to Erosion Weathering Types of Weathering Types of Weathering Mass Wasting
Robb, Bob, Outside Editor has reference to this Academic Journal, PHwiki organized this Journal Weathering, Mass Wasting, in addition to Erosion In previous chapters we discussed the internal processes that create relief. In this chapter we discuss the external as long as ces at work on the l in addition to scape. These as long as ces, though often miniscule, act over time to inexorably wear away at the l in addition to scape, trans as long as ming it, shaping it, while carrying material down towards the sea. Weathering > Mass Wasting > Erosion > Transport > Deposition Weathering The mechanical disintegration in addition to /or chemical decomposition that fragments rock masses into smaller components. The processes begin in: Microscopic spaces Joints Faults Lava Vesicles
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Difference between a joint in addition to fault: Faults show relative displacement. Joints are more common.
Types of Weathering Mechanical (Physical) – no change in chemical composition. Frost wedging Salt wedging Chemical – decomposition of rock through a chemical change in its minerals. Oxidation – important in iron-rich rocks Hydrolysis – igneous rocks have much silica which readily combines with water Carbonation – carbon dioxide dissolved in water reacts with carbonate rocks to create a soluble product (calcium bicarbonate) Types of Weathering Biological – plants in addition to animals contribute to weathering. Roots physically break or wedge rock Lichens (algae in addition to fungi living as single unit), remove minerals in addition to weaken rock by releasing acids Burrowing animals can increase weathering. Lichens Frost Wedging in joints
Frost Wedging in addition to Sheeting San Jacinto Mtns. Frost Wedging in Joshua Tree National Park, CA
Relationships between climate in addition to weathering Mass Wasting Process whereby weathered material is moved downslope under the immediate influence of gravity. Angle of Repose – the steepest angle that can be assumed by loose fragments on a slope without downslope movement. Talus or scree slope – pieces of rock at bottom of a rock fall. Angle of Repose Dependent upon the internal coherence of the material. Softer, looser material has lower angle of repose. Rock in addition to compressed sediments can have very high angles of respose.
Rockfall Pacific Palisades, November 1956
Pacific Palisades Slide, 1956 Monterey Park Debris Flow, 1980 La Conchita L in addition to slide, January 10, 1995
Triggered by powerful winter storms. Killed 10 people; destroyed 18 homes. Previous l in addition to slide in 1995 destroyed 9 homes but killed no one. The rock slide at Frank, Alberta, Canada (1903) moved 33 million cubic meters of rock from Turtle Mountain over the town of Frank in less than two minutes killing 70 people.
Yosemite Rockfall, 1996 78,000 cubic yards of granite fall from Glacier Point, destroying Happy Valley Nature Center in addition to killing one. Erosional Agents in addition to Deposition Running Water Stream L in addition to scapes Glaciers Waves in addition to Currents Wind
Is this river aggrading or degrading Is it near the headwaters or the delta Graded, near the middle or end of its course. Missouri River, MO Is this stream aggrading or degrading Is it near the headwaters or the delta Is this stream aggrading or degrading Is it near the headwaters or the delta DEGRADING, NEAR THE HEADWATERS Canadian Rockies
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