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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.
- Spring '08