... understand this apparently confusing statement, it is necessary to separate the carbon cycle into two cycles: the short-term cycle and the long-term cycle The Short-Term Carbon Cycle The carbon cycle, ” ... geologic time 40 The Phanerozoic Carbon Cycle Processes of the Long-Term Carbon Cycle: Organic Matter and Carbonate Burial and Weathering The organic subcycle of the long-term carbon cycle, where ... atmospheric CO2 and O2, including volcanism, the role of plants in weathering, the weathering and burial of organic matter and pyrite, and the weathering of basalt (Berner and Maasch, 1996) 8 The Phanerozoic...