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Story of the snowball Earth 02TB-SNOWBALLEARTH1-superJumbo-v2 - Coggle…
Story of the snowball Earth 
Namibia's skeleton coast
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rocks dominated by calcium and magnesium carbonate minerals lie just above the glacier debris which represents the hot-house
Albedo Effect
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Sea water reflects less because of its darker colour, which means it absorbs more than snow
With high albedo, snow and ice cool the atmosphere during ice ages, creating a positive ice-albedo feedback loop
Extreme Survival
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Cyanobacteria and certain algae occupy habitats of snow, porous rock, and surfaces of dust particles encased in floating ice
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Cold reversal
During global glaciation, shifting tectonic plates would build volcanoes and supply atmosphere with co2
Clue 1
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Typically form in warm, shallow seas
Thick sequences of carbonate rocks are consequences of extreme greenhouse conditions unique to that after snowball earth
Clue 2
They contain unsual pattern in ratio of two isotopes of carbon, carbon 12 and 13, which has an extra neutron in its nucleus
Volcanoes spew out C 13 and 12, but since seawaters contain algae which prefer 12 over 13, ratio is different to original