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Definition
| Moves under the influence of its own weight and gravity. |
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Definition
| 75% of the world's freshwater supply. |
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| 10% of the land surface of the Earth. |
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Term
| If all the global supply of land ice stored in glaciers melted, then how far would sea level rise? |
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Definition
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Definition
| Glaciers that are confined to valleys |
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Definition
| Glaciers that cover more than 50,000 square km. |
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Definition
| Glaciers that are not confined to valleys and cover less than 50,000 square km |
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Term
| Two continents that contain continental glaciers |
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Definition
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Term
| How is a continental glacier distinguished from an alpine or valley glacier? |
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Definition
Size-- they exceed 5,000 square km.
Location-- They are not confined to valleys. |
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Definition
| Defined as the results of multiple snowfalls over a single winter. |
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Definition
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Definition
| Composed of ice crystals and voids filled with air. |
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Definition
A line marking the highest point at which a glacier's winter snow cover is lost during a given season.
-Boundary between the zones of accumulation and wastage. |
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Definition
| Marks the farthest down valley extent of a glacier. |
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Term
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Definition
| Occurs if the amount of water and ice glacier looses is greater than the amount of snow it gains. |
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Definition
| Refers to the movement of the whole glacier over bedrock. |
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Term
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Definition
| Occurs in the lower part of the glacier between the interface with the bedrock and the overlying zone of rigidity. |
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Definition
| Occurs above the zone of plastic flow. |
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Term
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Definition
| An open void or crack that occurs in the zone of rigidity. |
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Definition
| Produced by the movement of the glacier away from the areas where melt water has seeped into cracks and frozen. |
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Term
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Definition
| Poorly sorted and un-layed debris composed of gravel, sand, and clay that was deposited by glacier. |
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Term
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Definition
| Valleys that were once occupied by a glacier. |
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Term
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Definition
| Ampitheater-like depressions occuring at the heads of the glacial valleys |
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Term
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Definition
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Definition
| Occured 1.6 or 1.8 million to 10,000 years ago during the Pleistocene Epoch. |
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Definition
| Glacial and inter-glacial periods are likely caused by variations in the Earth's position and orientation relative to the Sun. |
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Term
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Definition
| Upper part of glacier that is covered with snow year round. |
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Term
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Definition
| Lower part of glacier where calving, melting, and evaporation occur. |
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Definition
| Grooves in polished glacial surfaces. |
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Definition
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Definition
| Small glaciers that feed the main valley glacier. |
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Definition
| Ridges extending down into the main glacial valley that have been truncated by the larger glacier once occupying the valley. |
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Definition
| Series of glacial lakes that occupy a valley once occupied by a glacier. |
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Definition
| Blocks of granite resting on the polished glacial surface at Ohmsted Point, Yosemite National Park. |
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Term
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Definition
| A valley once occupied by a tributary glacier. Bridalveil Creek in Yosemite National Park is an example. |
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Term
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Definition
| Soothed streamlined hill cut into the bedrock. |
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Term
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Definition
Mt. Russell and Mt. Carillon are pyramid-like in form. They were produced by the head ward erosion of glaciers that once occupied the valleys that now
surround them. |
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Term
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Definition
| Knife-sharp ridge separating adjacent glacial valleys. |
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Definition
| Ridge of till that lies along the terminus of the valley glacier. |
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Definition
| Ridge of material produced by a glacier that was retreating. |
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Definition
| Ridge of material produced by a glacier that had reached its most down valley extent. |
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Definition
| Ridge-like accumulations of till located along the margins of each valley glacier. |
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Term
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Definition
When two valley glaciers merge, till accumulating along their interiors also merge to form a
single distinctive ridge lying between the two glaciers. |
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Term
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Definition
| streamlined hills of sediment. |
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Term
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Definition
| long sinuous ridge composed of water-deposited sediment |
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Term
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Definition
| When blocks of ice buried by sediment along the retreating margin of a continental glacier melt a depressions forms. |
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Term
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Definition
If sediment is washed into openings and depressions at the terminus of a wasting continental
glacier, then a small hill is left behind. |
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Term
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Definition
| the orbital path of the Earth around the Sun as varying from nearly circular to highly elliptical. It takes the Earth ~100,000 year to complete this cycle. |
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Term
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Definition
he tilt of the Earth’s axis either toward or
away from the sun as varying over the range of 22.5o to 24.5 o. Currently, the tilt is 23.5o. It
takes the Earth about ~43,000 years to complete one cycle of this variation in tilt. |
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Term
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Definition
the Earth’s axis wobbles like a top slowing down as it
orbits the Sun. The Earth complete one cycle of this wobble every 20,000 years. |
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