Three major glacial episodes

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Three major glacial episodes (Ice-houses)
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Polar Position Hypothesis Glaciations occur when
continents are located near the poles.
However
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Spreading Rate Hypothesis (BLAG)
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BLAG Carbon Cycle

• On Land CaSiO3 CO2 -gt CaCO3 SiO2
• Subduction CaCO3 SiO2 -gt CaSiO3 CO2