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Ch.12 (Final)
Glaciers
| Question | Answer |
|---|---|
| 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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