Earth's Climate: the 1st 4 Billion Years
Earth's Climate: the 1st 4 Billion Years
Earth's Climate: the 1st 4 Billion Years
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Chemical Wea<strong>the</strong>ring = chemical attack<br />
of rocks by dilute acid<br />
C O 2 + H 2O H 2CO 3<br />
----------------------------------------------<br />
1. Carbonate Wea<strong>the</strong>ring:<br />
CaCO 3 + H 2CO 3 --> Ca 2+ + 2 HCO 3 -<br />
2. Silicate Wea<strong>the</strong>ring:<br />
CaSiO3 + 2 H2CO3 --> Ca 2+ -<br />
+ 2HCO3 + SiO2 + H2O -------------------------------------<br />
• 2x CO 2 consumption for silicates<br />
• Carbonates wea<strong>the</strong>r faster than silicates<br />
Geochemical<br />
Carbon Cycle<br />
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