Mass Movement, Wind, Glaciers. Mass Movement. A down slope movement of loose sediment and weathered rocks resulting from the force of gravity. Erosion following weathering climatic conditions determine which materials and how much All mass movements occur on slopes
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Catastrophic mass movement - most common on slopes greater than 25° with annual rainfall of over 90 cm.
Strong winds - carry long distance (suspension)
Saltation - Bounding motion of particles, ie. sand wind transport occurs in areas with little vegetation, ie., desserts, some arid areas, seashores and lakeshores
Wind transports material up hill and down erosional agents that are modified, ie. wind changes the landscapes in arid and coastal
Deflation - lowering of the land’s as surface result of movement. Problem - agriculture regions: 1930’s Dust Bowl - Sever dust storms - clouds of dust blown by the wind create deflation
blowouts - shallow depressions
Occurs in arid regions of change in wind
velocity. Particles drop out of the air to the ground
Formation of Dunes - sand accumulates from the dropping of wind. A dune is a pile of wind blown sand. Conditions necessary for
formation of dunes:
2) Wind velocity
3) Wind direction
4) Amount of vegetation
Desert Pavement - when finer sediments are blown away by wind and the heavier larger particles and pebbles are left behind.
GlaciersThey shape the landscape by: a) eroding b) transporting c) depositing huge volumes of rock and sedimentsToday, scientists measure movements and size changes of glaciers to track climate change.