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The Snowball Earth
Essay specific features
Written by:
Benjamin D
Date added:
August 6, 2015
Level:
University
Grade:
A
No of pages / words:
21 / 5794
Was viewed:
9915 times
Rating of current essay:
Essay content:
Hoffman and Daniel P. Schrag
August 8, 1999
CONTENTS
Introduction
Frozen and fried
Sea ice at the equator
The acid test
Survival and redemption of life
Snowball episodes and Earth history
Further reading
Illustrations
Introduction
Geology tells us that the Earth's climate is subject to change on various timescales, but what are the limits to climatic variability? Over the last million years that constitute the Pleistocene epoch, the time in which humans evolved, continents bordering the North Atlantic Ocean were periodically glaciated at intervals governed by changes in the Earth's orbit around the Sun...
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At the height of the last ice age, a mere 21,000 years ago, much of North America and Europe were covered by glaciers over 2 kilometers thick, causing sea level to drop by 120 meters. The chill was global: land and sea ice combined to cover 30 percent of the Earth's surface, more than at any other time in the last 500 million years...
displayed 300 characters
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