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Glaciers and Climate
Glaciers
| Question | Answer |
|---|---|
| Glacier | large mass of moving ice |
| Alpine Glacier | mountain glacier |
| continental glacier | mass of ice |
| basal slip | glacier slides due to melting at the base |
| Internal Plastic Flow | Glaciers flow slowly under pressure and slides top over bottom |
| Crevasse | large crack in glacier |
| snowfield | motionless mass of ice and snow |
| Ice Shelf | ice sheet that moves over the ocean |
| Cirque | deep, bowl-shaped depression created by erosion |
| Arete | sharp-jagged ridges |
| Horn | pyramid shaped peaks created by Aretes |
| Erratic | large rock moved by a glacier |
| glacial drift | all sediment transported by a glacier |
| till | unsorted glacial drift |
| moraine | glacier deposits till in the form of a ridge (includes terminal moraine, lateral moraine, medial moraine) |
| kettle | steep depression in a glacial drift deposit |
| esker | long-winding ridges of sand and gravel |
| Ice Age | long period of cooling when continents are glaciated |
| Milankovitch Theory | cyclical changes in Earth's movement relative to the sun |
| Interglacial Period | glaciers retreat (inbetween ice ages) |
| precession | a wobble in Earth's axis |
| ice cores | hold evidence of past glacial ages |
| before an ice age | slow drop in temperature |
| How do crevasses form? | the surface of a glacier cracks |
| How do icebergs form? | calving |
| What happened to the sea levels during the last ice age? | they were lower than today |
| What happens to ice when a glacier moves by basal slip? | it slides |
| How do you calculate velocity? | distance/time |
| What is the difference between speed and velocity? | same formula, (but speed has direction) |
| Small changes in what 3 things cause glacial periods (according to Milankovitch)? | earth's tilt, earth's orbit, precession/axis |
| Where can you find evidence of past glaciation? | ice cores |
| What occurs before an ice age begins? | slow drop in temperature |
| What are some other explanations for glaciations? (other than milankovitch) | sea currents human impact continental shifts shifting of Antarctica |
| How do glacial periods and interglacial periods differ? | glacial= glaciers advance interglacial= glaciers retreat |
| erosion and deposition | 2 processes that form glacial lakes |
Created by:
Amatulli Science
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