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test 5

exam 5 tbc...

QuestionAnswer
What is the gradient of a stream that drops 80ft. on elevation over a distance of 3 miles? ft/miles=80 ft./3 miles=26.667ft./miles
artesian Spring water rises to the surface due to pressure where the recharge area is at a higher elevation
Natural Spring groundwater flows freely where it intersects the water ta
Hot springs groundwater warmed (usually) by magma
groundwater depletion(wells) a. the water table around a well is lowered forming a cone of depression b. if pumping rates exceed recharge, the water table may be lowered permanently
land subsidence the structure of some aquifers is supported by the water in them. Removing water allows rock and sediment to compress resulting in subsidence of the land surface above
saltwater intrusion water in coastal aquifers often flows into the ocean. If pumping rates eliminate this flow, saltwater can flow freely into the aquifer
caves are natural underground cavities. Most are formed by the dissolution of limestone
stalactites hang from the ceiling
stalagmites grow up from the floor
columns stalactites and stalagmites that have grown together
Karst Topography landscapes shaped by dissolving power of groundwater
Sinkholes circular surface depressions
Disappearing Streams surface streams that drain under ground
Geysers deep groundwater changes to steam, increased pressure causes eruption of groundwater at surface
Glacier a moving body of ice that forms from the accumulation and compaction of snow
alpine(valley)glaciers(mountain glaciers) confined by surrounding mountains
Cirque glaciers create and occupy semicircular basins on mountainsides
Valley glaciers develop when a growing cirque glacier flows into preexisting stream valley
Icecaps cover the tops of mountains
Continental ice sheet an extremely large ice mass that blankets much or all of a continent
zone of accumulation where snow accumulates
zone of wastage loss of ice and snow
calving breaking off of large pieces (origin of icebergs)
ablation overall loss of snow and ice at glacier’s lower end
basal slip except in polar regions, most glaciers have liquid water at the bottom which they slide along
glacial plucking water at the base of the glacier seeps into bedrock fractures, freezes and expands, and breaks of large fragments
glacial abrasion rock fragments embedded in the bottom of a glacier scrape, polish and cut striations in the surface of the underlying bedrock
cirque depression carved out by a cirque glacier
Tarn cirque lake
Arete a sharp ridge between two valley glaciers
Horn a steep angular peak formed when three or more cirque glaciers erode a mountain
Glacial Trough wide, U-shaped valley
Fracture zone
Roche Moutonee rounded, asymmetrical mountains
glacial till poorly sorted sediment deposited directly from glacial ice
glacial erratic large, glacially transported rock
moraine deposited at the bottom or edges of a glacier. 1. lateral moraine 2. medial moraine 3. end moraine 4. ground moraine
drumlin egg shape hill
stratified drift Deposits from Glacial Meltwater Streams – well sorted stream deposits
outwash sediment deposited downstream of the glacier
kettle lakes form when large chunks of ice embedded in outwash
kame roundish hill of sediment that filled in an open space in the glacier
eskers sinuous ridges deposited by streams flowing in a glacier
crustal depression and rebound the weight of a glacier depresses the crust into the asthenosphere. When the glacier melts, the land rebounds
milankovitch cycles may have the effect of lowering solar radiation to polar latitudes allowing glaciers to form
Plastic Flow glacier’s ice crystals deform and slip past each other under pressure from overlying ice
Glacial drift any sediments of glacial origin
milankovitch cycles process a. earth’s orbit shifts from nearly circular to more elliptical b. change of the tilt of the earth’s axis c. precession
Created by: danyy30
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