How would the carbonate-silicate geochemical cycle respond to a long-term decrease in surface temperature and precipitation?
a. carbon dioxide would accumulate in the atmosphere as the weathering rate decreased, acting as a negative feedback
b. carbon dioxide would accumulate in the oceans as the weathering rate increased, acting as a positive feedback
c. carbon dioxide levels would decrease in the atmosphere as the weathering rate increased, acting as a positive feedback
d. volcanism would increase as a result of the decrease in surface precipitation, increasing carbon dioxide levels and acting as a negative feedback

C. Carbon dioxide levels would decrease in the atmosphere as the weathering rate increased, acting as a positive feedback

Explanation:

The CO₂ concentration decreases due to large scale weathering process of silicate and carbonate weathering . The weathering of silicate and carbonates affect this way . As CO₂ in the atmosphere decreases the global temperature decreases , resulting in global cooling or ice age. During ice age we will have less precipitation .

they are both the same distance away from the equator and from the poles. both circles are at 66 1/2 degrees. also they both form imaginary line borders of polar regions.

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