Geology Exam 3 GE2000 Questions with Answers
continental glaciation - Answer-exists where large part of a continent is covered by glacial ice
valley glacier - Answer-confined to a valley and flows from a higher to a lower elevation
ice sheet - Answer-a mass of ice that is not restricted to ...
continental glaciation - Answer-exists where large part of a continent is covered by
glacial ice
valley glacier - Answer-confined to a valley and flows from a higher to a lower elevation
ice sheet - Answer-a mass of ice that is not restricted to a valley but covers a large area
of land
Formation of Glaciers - Answer-Glaciers develop as snow, is compacted to granular
snow and recrystallized, first into firn snow and then glacial ice (fine-grained ice to
coarse grained ice)
glaciers can only form - Answer-where more snow accumulates during the winter than
melts away during the spring and summer
Glacial Ice = - Answer-metamorphic "rock"
gravity - Answer-is the driving force for movement of glacial ice
weight, 60 - Answer-Ice cannot support its own ___ and yields to plastic flow. Movement
begins at a thickness of about __ meters.
Two Essential Parts to Glaciers - Answer-Zone of Accumulation and Zone of Ablation
advancing glacier - Answer-gains more snow than it loses, has a positive budget
terminus (end) of advancing glacier - Answer-advances downslope
receding glacier - Answer-negative budget
Terminus of receding glacier - Answer-shrinks back upslope
zone of accumulation - Answer-Snow is added to glacier
zone of ablation - Answer-melting and calving of icebergs
equilibrium line (firn line) - Answer-separates accumulation and ablation zones, will
advance or retreat depending on climate
, accumulation = ablation - Answer-no advance or retreat, but continues to flow
accumulation > ablation - Answer-glacier advances while flowing
accumulation < ablation - Answer-glacier retreats, but continues to flow
downslope - Answer-Valley glaciers and ice sheets move ___ under the force of gravity
basal sliding, plastic flow, rigid zone - Answer-Movement occurs by ___ ___ and ___
___ of the lower part of the glacier, and passive "riding along" of an overlying ___ ___.
Crevasses - Answer-fractures formed in the upper rigid zone during glacier flow
friction - Answer-Due to ___, glacier flow is fastest at the top center of a glacier and
slowest along its margins
Glacial landforms can be divided into: - Answer-Erosional and Depositional
Erosion by glaciers - Answer-Glacial plucking and Abrasion
Glacial plucking - Answer-lifting out and removal of fragments
Abrasion - Answer-rocks within ice grind against underlying bedrock like sandpaper;
fragments within glaciers are rounded and smoothed
Glacial Polishing - Answer-characteristic of rock surfaces where glaciers have passed
over bedrock
Erosional landforms produced by valley glaciers include: - Answer-U-shaped valleys,
Hanging valleys, Cirques, Arêtes, Horns
U-shaped valleys and Hanging valleys - Answer-Smaller tributary glacial valleys left
stranded above more quickly eroded central valleys
Cirques - Answer-Steep-sided, half-bowl-shaped recesses carved into mountains at the
heads of glacial valleys
Horns - Answer-Sharp peaks remaining after cirques have cut back into a mountain on
3+ sides
Fjord - Answer-water filled glacial valley on the sea coast caused as sea level rises as
globally glaciers melt
Earthquake - Answer-Energy that is released when:
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