landform formation by erosion
DESCRIPTION
Landform Formation by Erosion. Water Cycle = Hydrological Cycle. A series of events where water is stored and/or transferred. Water Storage. Water is stored in lakes, rivers, clouds, snow, and glaciers. Methods of Transfer. - PowerPoint PPT PresentationTRANSCRIPT
Landform Formation by Erosion
Water Cycle = Hydrological Cycle
• A series of events where water is stored and/or transferred.
Water Storage
• Water is stored in lakes, rivers, clouds, snow, and glaciers.
Methods of Transfer• Precipitation (rain), rain runoff, condensation, sublimation,
evaporation, transpiration, and snowmelt.
• Weathering is the slow breakdown of rock through chemical, biological and physical processes
Weathering
Erosion• The breakdown of rock by wind,
gravity, water, and ice
Wind • AKA – Aeolian or alluvial Erosion• Causes sand dunes and alluvial fans
Gravity • Mass movement of sediment. • Ex. Landslides, mudslides,
avalanches
Water Erosion• Splash Erosion – caused by
raindrops• Sheet Erosion – caused by
flat sheets of rain pouring off
• Rill Erosion – caused by small narrow areas where rain gathers and drains.
• Gully Erosion – water then erodes away larger gullies.
Lateral Erosion• Erodes the sediments on
the sides of streams.• Meanders are the S
shaped bends in a river formed when a river flows over a flat plain.
• Rivers deposit sediment on the inside of curves and erode banks on the outside.
• The downward cutting into bedrock by a stream forming valleys (hilly) and gorges (mountainous).
Vertical Erosion
Oxbow Lakes• Sickle shaped lakes
that form from meanders.
• A meander is cutoff from the river leaving an oxbow lake.
River Delta
• River deltas are formed by constant deposition of sediment being deposited in the ocean or large lakes in a fan shape.
Shoreline Erosion• Caused by the
pounding of surf and tidal movements.
• Creates crescent shaped beaches.
Human Effects• Any process that
removes vegetation (ranching and some construction) increases erosion.
• Topsoil removal for farming also increases erosion.
Erosion in Alaska
• Matanuska River• Revegitation
and Erosion Control• Shishmaref Village (video)