Snowball Earth Discussion Questions

Snowball Earth - Name Kimberly Glennon Snowball Earth(Hoffman and Schrag 1999 Please type answers and bring to class on Friday Nov 13 1 What is the

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Name: Kimberly Glennon Snowball Earth (Hoffman and Schrag 1999) Please type answers and bring to class on Friday, Nov. 13 1) What is the evidence for Earth being completely covered by ice around 700-600 million years ago? How many times did this happen? (2 points) According to the article, thick layers of ancient rock hold evidence that the Earth was completely covered by ice around 700-600 million years ago. The discovery of glacial iron-rich debris near sea level in the tropics supports this hypothesis. Earth being completely covered by ice around this time happened approximately 4 separate times. 2) What is the evidence that the ice-covered Earth warmed rapidly? (2 points) According to the article, evidence that the ice-covered Earth warmed rapidly is found in rocks that formed from deposits of dirt and debris left behind from the melted glaciers. Just above the glacial debris are rocks that rich with calcium- and magnesium-carbonate minerals that support this hypothesis. These minerals aligned with the magnetic field of
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This note was uploaded on 01/23/2012 for the course GLG 121 taught by Professor Dong during the Fall '11 term at Miami University.

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Snowball Earth - Name Kimberly Glennon Snowball Earth(Hoffman and Schrag 1999 Please type answers and bring to class on Friday Nov 13 1 What is the

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