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Chapter 20 Meredith
Chapter 20 review study stack for Earth Science
| Question | Answer |
|---|---|
| What is a Glacier? | mass of ice produced when snow is compacted and refrozen that moves under the influence of gravity. |
| what are glaciers sometimes called? | icebergs. |
| from what do glaciers form? | winter snow that does not melt during summer. |
| what are snowfields? | large expanse of snow-covered terrain above the snowline. |
| what is a snowline? | imaginary line that separates lower, warmer areas where snow melts during the summer. |
| what is a firn? | glacier ice formed compacting and refreezing snow |
| what is glacier ice? | form of ice consisting of interlocking crystals produced by pressure |
| when does glacier ice form? | when all the air is squeezed out. |
| what is the accumulation zone? | zone above the snowline where fallen show does not melt completely. |
| what is the wastage zone? | a zone in a lower, warmer elevation that is decreased in size due to melting and evaporation. |
| what is the equilibrium line? | imaginary line separating the accumulation and wastage zones. |
| What is terminus? | the lowest end of a glacier. |
| what is a valley glacier? | found in a narrow valley that is surrounded by mountains. |
| what is the most common type of glacier? | valley glacier. |
| what is a peidmont glacier? | broad glacier formed by the merging of 2 or more valley glaciers near the foot of the mountain. |
| what are ice sheets? | thick layers of glacial ice covering an extensive area. |
| what is a continental glacier? | vast, thick ice sheets that cover a large portion of a continent or large island. |
| what is an ice cap? | thick, widespread and permanent cover of glacier ice and snow on a flat, land mass. |
| what is an iceberg? | large fragment of floating ice that broke off the edge of a glacier into the ocean through a process called calving |
| what percentage of an iceberg is normaly underwater? | 80-90% |
| how do you determine how mutch of an Iceberg is below water? | by the salinity and the density of the water and ice. |
| what are ice floes? | flat expanse of floating ice formed when frozen sea water breakes up. |
| what is the zone of fracture? | vertical depth zone consisting of brittle ice that extends from the surface to 50 m below the surface. |
| what is the zone of flow? | lower depth that flows over bedrock |
| Name 6 things that affect glacial movement | liquid water flowing under the glacier,rate and quality of snow, lengths of seasons, avg. temperatures, pools of melted water on the surface, and amount of glacial flour and debris on surface. |
| what is plucking? | fragments of bedrock are pulled away by the ice as it moves over bedrock |
| what is glacial polish | smooth area of bedrock caused by glacial movement |
| what is a hanging valley? | small glacial valley that enters a glaciated valley from high on one side |
| what is a cirque? | steep-sided, hollow excavation in a mountain-side. |
| what is a tarn? | small pond or lake in a glaciated mountain valley that has no outlet. |
| what is a horn? | a jagged mountain peek left when glacial erosion forms 3 or more cirques. |
| what is glacial drift? | any kind of deposit left by a glacier, |
| what is glacial till? | unsorted debris dropped in a place as a glacier melts. |
| what is a boulder train? | boulders from distant bedrock left by a glacier. |
| what is an outwash plain? | produce melt water stream flowing from the terminus |
| what is a kettle lake? | lakes that form in outwash plain or ground moraine. |
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kdcribb
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