Sand and Ice
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Created by:
sarahb1997 on May 27, 2010
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27 terms
Terms | Definitions |
|---|---|
 big boulders left behind by glaciers | erractic |
| they scraped the land down to the bedrock | how did the ice age form the base for skyscrapers in NYC? |
| 10 | how many ice ages have there been in the past million years? |
| it looked like a bowl because the ice pushed the land down and it digs it out | when the ice was removed from Greenland, what did the island look like and why? |
| Juneau, Alaska | where is the Mendenhall Glacier? |
| buried mountain peaks in Juneau | What are Nunetaks? |
| crud- it falls from the valley walls | what are found on the surface of a glacier? how do they get there? |
| the ice cracks over dips | what causes crevasses to form in the ice? |
| crystals bigger/air smaller, flat and aligned | what two changes happen to ice crystals as they are buried deeper and deeper in a glacier? |
| big mounds of soil found at the base of a glacier | where are terminal morraines found? what are they made of? |
| 3 | how many feet a day does a glacier move? |
| glacier scraped, tells where glacier came from | how were the grooves made at central park? what information did this give scientists? |
| finger lakes | what group of lakes in NY were made by the last glaciers? |
| U-shape | what distinctive shape do glacier carved valleys have? |
| goes elliptical/oval | Malankovitch theory- the earth's orbit does what every 100,000 years? |
| inclination changes | malankovitch theory- earth's axis does what every 40,000 years? |
| snow was not melting | how did colder summers give rise to the last ice sheet in Canada? |
| measures reflectivity, ocean takes longer to cool | what is albeido? how did the effect make the land even colder? |
| less reflective/albeido | why did the ocean cool slower than the land? |
| feedback loop | when there is a large temperature difference between Canada (c) and Gulf Stream (w), what is the weather pattern? |
| 1/3 or 1/6 | what fraction of the Earth's land was covered by ice during the last ice age? |
| water erosion, at the top of rocks | what evidence do Sahara desert rocks show about former climate? why could blowing sand not have done this? |
| river under sand | what did the space shuttle radat show? |
| change in desert, forests | what do the recent stone paintings show? the older ones? |
| shrink before, expand after | when an ice age starts what happens to the dry belts above and below the equator? after? |
| equator, continental drift carry through | what caused african climate to be tropical in dinosaur times? |
| steadily decreasing by evaporation | what did space shuttle images show happening to lake chad between 1970 and 1980s? |
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