The pressure on the surface of Mars is about 7.5 mb compared to about 1013 mb on

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The pressure on the surface of Mars is about 7.5 mb compared to about 1013 mb on Earth.  The mks unit of pressure is the Pascal.  In pascals, the earths surface pressure is 1.013 x 10^5 Pa.  The acceleration due to gravity on Mars is 3.72 m/sec^2.  The radius on Mars is 3398 km.  

If the mass of carbonate rocks in the crust of the Karth is 3.5 times 1020 kg. What would the I arth s atmospheric pressure be if all of these rocks were converted to CO2? Use 6370 km for the radius of the Karth and g = 9.8 m/sec2. Compare the result for problem 5 with the atmospheric pressure on Venus which is roughlv 90 bars ot CO2? What process on Earth could account for the difference? How many cubic kilometers of calcite would account for the difference in the pressure of Earth CO2 atmosphere vs. the current one for Venus? Fossil fuel burning is currently contributing the equivalent of converting 35 km3 of calcitc per year into CO2 and dumping it into the atmosphere. Residence time is defined as the mass of the reservoir div ided by the rate of the process, x= M/k. What is the residence time for anthropogenic carbon dioxide? If the calcite-water stable isotope fractionation factor is given by delta caJcite-water= delta calcite - delta water = 2.78 times 10 6/T2 - 2.83 (in per mil), what is the surface water-bottom water temperature difference for the Austion Chalk seaway assuming the water isotopic composition remains constant throughout the column and that T is in Kelvin. The isotopic difference between planktonic and benthonic calcite is about 0.75 ner mil. Calcite can be measured to less than 0.1 per mil precision.

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