The Snowball Earth

Essay specific features

 

Issue:

Science

 

Written by:

Benjamin D

 

Date added:

August 6, 2015

 

Level:

University

 

Grade:

A

 

No of pages / words:

21 / 5794

 

Was viewed:

9854 times

 

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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...
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