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Geo Ch.19


Impact Of Glaciers on the landscape Snowpack over years turn into ice
Continental ice sheets(type of glaciers) Exist in nonmountainous areas
Examples is Continental ice sheets Antarctica & Greenland
Mountain Glaciers (type of glacier) Highland ice fields: ice sheets the submerge most underlying topography; valley and Piedmont glaciers
Erosion by glaciers volume and speed determine success
Glacial Abrasion Bedrock worn down by rock debris embedded in glacier
Glacial Plucking Picking up of rock material through refreezing of meltwater
Transportation by glaciers remaining glacial ice free of rock debris
Deposition by glaciers Glaciers move material from one region to another in a vastly different form
Drift material moved by glaciers
Till rock debris deposited by moving or melting ice
Erratics Large boundaries that are different from surrounding local bedrock
What initiates ice ages? Eventual total deglaciation Multiple ice advance and retreat cycles Hemisphere but in non-uniform
Climate change relate to contemporary glaciation
Medieval Warm Period & Little ice age 1200-1800 period of cooling Southward movement of tree line and farming
Ice cores from Greenland & Antarctica Plant pollen, summer particles, isotopes, ash from large forest fires, explosions in insect population
96% of the total ice cover Greenland, Antarctica, and North America
About 10% of ice cover land surface
Glaciers form by snow turning into crystallized water vapor that is compressed to granular form it eventually turns in glacial ice.
Ice sheets are Third most extensive feature on the planet
Pleistocene Glaciation began at least 2.59 million years ago
Last major ice retreat occurred only 9000 years ago
Periglacial zone zone where ice never existed but glacial factors affected the landscape such as erosion from ice melt, solifluction
Sea level changes buldup of ice on continents led to less drainwater on continents and brought about a lowering of sea level
Pluvial development considerable runoff results in increased moisture, leading to increased precipitation and less evaporation
Created by: Srankins3



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