Bio 201 S10 Lect 2 (True) v2r

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Unformatted text preview: is: this led to “Snowball Earth” Snowball Earth hypothesis •  During Cryogenian period •  (850‐630 million years ago) •  Con9nents concentrated in tropics –  Absorbed less heat from sun than open ocean –  More rainfall ‐>more erosion -”Anti-Greenhouse effect” •  Erosion removes CO2 from atmosphere •  e.g. CaSiO3 + 2CO2 + H2O → Ca2+ + SiO2 + 2HCO3- •  Glaciers covered virtually the en9re Earth •  Only marine microorganisms survived The end of snowball Earth •  Volcanic ac9vity eventually melted the ice and broke up Rodinia •  Ice retreated •  This set the stage for evolu9on of...
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This note was uploaded on 02/18/2010 for the course BIO 201 taught by Professor True during the Spring '08 term at SUNY Stony Brook.

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