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Earth 2 Thursday, February 25th, 1999 Announcements: Tests were returned and the second part of our textbook was picked up. Lecture notes: CLIMATE VARIATIONS TENS OF MILLIONS OF YEARS AGO Shows that the earth's climate was far from stable tens of millions of years ago Cold Climate Ice covered much of the earth at different points in time--21,000 years ago, 1/3 of the land was covered with ice. 280,000,000 years ago, almost the entire globe was covered with ice Grooves and striations show up, proving that ice is ripping up material in the environment Materials are picked up by ice and deposited where the ice melts (tills) Moraines are found, with unsorted materials and in various sizes Dropstones , which fall from the surface, disrupt sediments, and later have layers built upon them over time, are found near glaciers Antartica glaciated 28-35 million years ago, Greenland glaciated 3 million years ago The world was 3-5 degrees cooler than it is today Warm Climate Uniformitarianism --explains that the present is the key to the past. An
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  • Spring '99
  • Eigenbrode

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