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When the climate began to warm during the last Ice Age about 23,000 years ago, much of the Northern Hemisphere was covered I in ice.
In two new studies published this week in Nature Geoscience, researchers describe how ice sheets behaved in the past could help scientists better predict what might happen to them in a warmer world of our future.
(11) ___________
University of Wisconsin geologist Anders Carlson studies ice sheet melt from land and ocean sediment cores. His study describes what prehistoric Earth was like in North America and Northern Europe some 140,000 years ago.
A. Old Ice Clues
(3) ___________
It is easier now than ever before for people to travel for pleasure. Most employees are given time off from work so they can go on vacation. They may also receive wages to cover the time they are away. Companies involved in tourism have made it easy for people to book a break by creating package vacations. Modern communication systems, especially the Internet, have made it simple for people to research and book their vacations. Transportation systems are also more advanced now than at any time in the past. People can fly, drive, or take a train or boat to destinations all around the world.
