KCC-EPS 33 JN Bigolski Physical Geology Spring 2022 Articles on Snowball Earth (various sources) H. W. #3 - DUE last day

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Kcc Eps 33 Jn Bigolski Physical Geology Spring 2022 Articles On Snowball Earth Various Sources H W 3 Due Last Day 1 (117.03 KiB) Viewed 180 times

KCC-EPS 33 JN Bigolski Physical Geology Spring 2022 Articles on Snowball Earth (various sources) H. W. #3 - DUE last day of class (June 7th). Answer all questions in a succinct manner. Please hand in the assignment by the due date as a typed double-spaced Word Document or PDF using 12-point font. DO NOT COPY & PASTE answers directly from the article(s) to as your answers. ANSWER THE QUESTIONS IN YOUR OWN WORDS. Must be submitted by 11:59 PM on the due date. 1) (a) Define the hypothesis of Snowball Earth. How many have there been in Earth's history? (b) Describe all the geologic evidence for this. When did the Cryogenian Period occur, and how long did it last? 2) (a) Describe the "chemical index of alteration" and how this was used to determine the extent of chemical weathering during Snowball Earth. (b) What evidence was found for climatic cycles? How can plate tectonics be used to explain these cycles? Does this support or refute the global ice-cover theory behind. Snowball Earth? 3) (a) Considering the position of continents at the equator or away from the equator, what crucial roll do carbonate rocks play in trapping greenhouse gases like carbon dioxide? (b) Do large deposits of carbonates indicate a worsening of glaciations (a road towards cooling) or a lessening of glaciations (a road towards warming)? (c) What role do plate tectonics and volcanoes have in worsening or lessening glaciations? 4) (a) How does the carbon cycle regulate global ice ages so that they are temporary? How did the MIT researchers use elements of the carbon cycle to develop mathematical model of Earth's climate system? (b) What does recent research suggest about the likely scenario for Snowball Earth? Describe the possible mechanisms that could have led to the conditions for Snowball Earth? 1| Page