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Ch.12 (Final)

Glaciers

QuestionAnswer
The sediment deposited by debris-laden melt water is called _______. outwash
Above the rigid zone, glacial ice movement is due to __. passive riding of the ice on the glacier
The grinding of rock against rock by a glacier produces a very fine sediment called ____. rock flour
____ are landscape features that indicate a mountainous area has been glaciated. Cirques, horns, and arêtes
Glaciers can be considered as _______ of fresh water for future use. deposits
Once a glacier is gone the land begins to uplift slowly to its pre-glacial height, a process called ____. crustal rebound
___ moraines are elongate low mounds of till that form along the sides of valley glaciers. Lateral
The _____ is the end of a glacier. terminus
The upper part of a glacier, the part with perennial snow and ice, is called the __. zone of accumulation
A worldwide decrease of at least _____°C in temperature would bring about a new glacial age. 5
As ice retreats by melting back, the rock debris carried by the glacier is deposited to form a relatively thin layer of till called a(n) ___________. ground moraine
A(n) _______ is a mass of ice that is not restricted to a valley but covers large areas of land. ice sheet
A(n) ___________ is an ice-transported boulder that was not derived from the underlying bedrock. erratic
A(n) _____ is a coastal inlet that is formed by a drowned glacial carved valley. fiord
A(n) ____ is a long sinuous ridge of water-deposited cross-bedded and well-sorted sediment deposited by a stream that flowed within or under a glacier. esker
The central portion of a valley glacier moves _____ the sides. faster than
When an ice block that was buried in sediment finally melts a depression called a ___ forms. kettle
A(n) ______ is a steep-sided half-bowl shaped recess carved at the head of a mountain glacial valley. cirque
A(n) _____ is the sharp peak that remains after cirques have cut back into a mountain on several sides horn
The down-valley part of a glacier is the ____, where melting, evaporation, and calving take place. zone of ablation
___ are the product of past glaciations. The Great Lakes
______ first suggested that glacial/interglacial episodes are related to variation in solar radiation cycles. M. Milankovitch
If the terminus of a glacier remains stationary for a few years a distinct _______ may form. recessional moraine
If a moving glacier reaches a body of water ______ float free. icebergs
A glacier will flow faster where it is steeper and _____. thicker
What caused the glacial ages? All of the above have contributed to the glacial ages.
Two layers of sediment resulting from one year's deposition in a glacial lake are called ___. varves
A(n) _____ -shaped valley (in cross section) is characteristic of glacial erosion. U
Under the influence of gravity a glacier moves down valley and eventually __. ablates
A large trunk glacier carves a deeper valley than smaller tributaries. After the glacier disappears the tributary valley remains as _____ high above the main valley. a hanging valley
If all ice sheets were to melt, sea level would _____. rise by over 60 meters
Open fissures called ___ develop in the brittle surface ice of glaciers. crevasses
The boundary between the zone of accumulation and the zone of ablation is an irregular line called the _____. equilibrium line
Bodies of till shaped into streamlined hills are called ___. drumlins
The theory of _____ states that at times in the past, colder climates prevailed during which much more of the land surface was glaciated than at present time. glacial ages
A(n) ___ is a lake occupying a bedrock depression excavated by a glacier. tarn
Sharp ridges called ___ separate adjacent glacially carved valleys. arêtes
Where tributary glaciers come together the adjacent lateral moraines join to form a ______ moraine. medial
Created by: Thomas.Siu
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