5453657
Description
Flashcards by Sophie Weldon, updated more than 1 year ago
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Created by Sophie Weldon
over 8 years ago
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| Question | Answer |
| ICE ON LAND | ALL ABOUT DASS ICE |
| ICE AGE | Periods of the earths past when conditions whenconditions are much colder and and large amounts of ice cover the land. |
| What was the last major ice age called? | It was 1.8 million years ago called 'Pleistocence' |
| ICE SHEETS | Huge moving masses of ice thr cover hole containets |
| ICE CAPS | Mini ice sheets |
| GLACIERS | Moving masses of ice which fill valleys and hollows |
| Ingredients need to form a glacier: | Time Snow Cold temperature Valley/hollow Young fold mountins/ high attitudes Steep gradients |
| What evidence that climates changed over the earths history | Geological evidence- landforms in rocks Fossils- they adapted to cold climates Chemical- comerstions of ice changes as temp changes |
| How do glaciers move? | Snow and ice thickens its then moves due to gravity and pressure of overlaying ice |
| Why are there cravasses in glaciers? | As the glaciermoves it flows in different speeds. The friction with the sides and the base causes tention so cracks apere. |
| ACCUMALTION | Imput of snow and ice into the upper part of the glacier called zone of accumaltion. |
| ABLATION | Output of water from galcier as ice melts, this happens at lower part of gacier called zone of abaltion. |
| EQUIBRIUM LINE | Accumation = ablation |
| GLACIAL BUDGET | Difference between accumulation and ablation over a year |
| POSITIVE BUDGET | Acumulation > abaltion. Glacier advances |
| NEGATIVE BUDGET | Ablation > accumaltion. Glacier retreats |
| CORRIE | Circular hollow in a mountin side with steep back wall and rock lipon open side. |
| TARN | Small, deep, circluar lake |
| PYRAMIDAL PEAK | Sharp mountain peak |
| ARETE | Narrow knife edge ridge on top of a mountain |
| GLACIAL TROUGH | Steep sided valley withflat floor in u-shaped formed when a glacier widens and deepens the valley |
| TRUNCATED SPUR | Steep valley sides, valley glaciers removed the ends of interlocking spurs by ablation |
| HANGING VALLEY | Tributary glacier left high above main glacier. Ice in main glacier melts quickly, leaving valley in the air |
| RIBBON LAKE | Long narrow lake in the floor of a gacial valley |
| SCREE SLOPES | Loose pieces of sharp rock lying at the floot of a rocky slope. |
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