GLG 141 2-1 - glaciers. 10. A moraine is a deposit of...

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Joe Littman GLG 141 B T/TH 2. The zone of accumulation is where a glacier forms and builds up, and the zone of wastage is where it melts and deposits all the till. The snowline is an imagineary line, above the snow doesn’t melt during the year, and below it the snow does melt. As the climate heats up the snowline retreats, and as climate cools the snowline advances. 4. As ice is compacted, the molecules become more rounded, and they recrystalize (under high amounts of pressure) forming ice. 6. They can take measurements on how a glacier is moving by driving stakes into the glacier and then watching how they move over time, similar to what was done in 18 th century in the Swiss Alps. 8. As glaciers move they pick up sediment, and carry it until the glacier melts (transporting sediments). To erode the landscape glaciers do two things, one they drag large rocks with them, and those rocks grind against the ground (Abrasion). Also the meltwater from glaciers can contribute to erosion, possibly increasing the speed of the
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Unformatted text preview: glaciers. 10. A moraine is a deposit of glacial till that is left behind by a glacier. There are many types of moraines, Ground, Terminal, Recessional, Lateral, and Medial. 12. A conveyor belt, because the sediment is picked up in the zone of ablation, the glacier flows down, and melts in the zone of wastage and deposits the sediment like a conveyor belt. 14. The landscape features are U-shaped valleys, places where erosion overdeepened valley to form lakes, hanging valleys, knife-edge ridges and pointed peaks, and moraines. 16. 16 million square kilometers of North America were covered by ice. 18. To determine how many glaciations occurred they can look at the number of glacial till deposits that are separated by native sediment layers. To determine when the glaciation occurred they can use the half-life of things (possibly glacial bark) found in the till left behind be the glacier....
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This note was uploaded on 12/28/2011 for the course IDS 159 taught by Professor Fischer during the Fall '08 term at Miami University.

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