Nova Movie - gradual 7. When did the deep freeze of...

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GEO 271: Humans and Natural Resources #677 Assignment #1: Secrets beneath the ice [16 points] 1/11/11 1. How much of the world's ice is held in Antarctica? [1 pt] 90% 2. What impacts would a 10% melting of Antarctica ice have on sea level? [1 pt] Raise sea level about 19 feet, 10 of millions of people would have to be relocated, effect what you can grow where, where you can live 3. How much of the world's fresh water is frozen in Antarctica? [1 pt] 70% In the Arctic Ocean there is a lot of floating ice, in Greenland the edges of the ice sheet are changing, Giant pieces of coastal ice are melting and falling off 5. When did ice first start forming in Antarctica? Where was Antarctica before its present location and what environmental conditions prevailed? [2 pts] 34 million years ago; Part of a super continent closer to the equator, much warmer today, tropical with Dinosaurs 6. Was the initial freezing of Antarctica gradual or abrupt? [1 pt]
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Unformatted text preview: gradual 7. When did the deep freeze of Antarctica finally take hold? Was this process gradual or rapid? [2 pts] 14 Million of years after the initial freeze; rapid 8. What do scientists study in ice records? How far does the current ice record go (before the expedition described in this video)? [2 pts] Tiny bubbles of the atmosphere from thousands and millions of years ago; 800,000 years 9. How much warmer was the earth during the Pliocene period (3-5 million years ago) compared to today? Why are scientists particularly interested in whether the eastern ice shelf in Antarctica melted during that time or not? [2 pts] 3-5 degrees warmer; If they melted then, they could melt again causing very high sea levels 10. What was the condition of ice in western Antarctica and the sea level during Pliocene relative to today? [2 pts] Sea levels rose about 23 feet – later said 60 feet with contributions from the Easter Ice Shelf; ice sheets melted and came back again many times...
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This note was uploaded on 08/31/2011 for the course GEO 271 taught by Professor Maingi during the Spring '11 term at Miami University.

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