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