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ScienceG2
More qs
| Question | Answer |
|---|---|
| What is the key to building glaciers? | More precipitation and decreased temperature. |
| What is the difference between confined and unconfined glaciers? | Confined will be in valleys, so limited by topographic features, unconfined are typically larger and will flow over the land without being bound by it. |
| What are examples of confined and unconfined glaciers? | Ice Caps, Ice Sheet. |
| How is a glaciers accumulation zone different than it's ablation zone? | High on the glacier, more snow, firn, and ice add more mass to the glacier in the accumulation zone, while at the base of the glacier, in the ablation zone, there is loss of ice due to melting and sublimation. |
| What force causes ice to move down slope? | Gravity by: 1) internal deformation of ice by pressure of overlying ice and 2) basal sliding of ice mass along the ground due to slight thaw at base. |
| How can a glacier made of ice erode a landscape made of rock? | 2 main mechanisms: 1) quarrying (plucking) and 2) abrasion- pluck, scrape, and gouge landscape |
| Explain quarrying. | Glacier freezes to rock landscape, gains leverage to pluck rock as it moves over, especially jointed or fractured bedrock. |
| Explain abrasion. | once the glacier carries the rock debris, it can scrape the underlying landscape and gouge softer rocks. |
| Explain striations. | Grooves cut into bedrock surface as frock fragments are carried along at the base of a glacier. Striations show direction glacier was moving |
| Compare U-Shaped and V-Shaped Valleys. | Rivers erode straight down, creating V-shaped valleys; however, glaciers erode broadly, creating steep sides and wide broad floor. |
| Explain hanging valleys. | tributary glaciers that don’t cut as quickly into bedrock as the main glacier, so when the glacier recedes, leave a flat valley that ends at a steep drop often forming waterfalls from hanging valley. |
| What is till and how does it form? | Unsorted mix of clay, sand, pebbles, and boulders formed when glacial ice melts, leaving debris (sediment.) |
| What is an erratic and how does it form? | Glacial sediment that travels far from its bedrock point of origin and differs dramatically from the bedrock where it is deposited. |
| What is moraine and how does it form? | Deposits of till left behind from glacial melting; named based on where they form relative to glacial anatomy (terminal moraine, medial moraine) |
| What factors make a glacier grow? | Precipitation increases (wetter) and temperature decreases (colder.) |
| What factors make a glacier shrink? | Precipitation decreases (drier) and temperature increases (hotter). |
Created by:
mgirl38
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