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图3 溶洞的示意图
$\begin{array}{*{20}{c}}{{\rm{CaC}}{{\rm{O}}_3} + {\rm{C}}{{\rm{O}}_2} + {{\rm{H}}_2}{\rm{O}} = {\rm{Ca}}{{\left({{\rm{HC}}{{\rm{O}}_3}} \right)}_2}}\\{{\rm{Ca}}{{\left({{\rm{HC}}{{\rm{O}}_3}} \right)}_2} = {\rm{CaC}}{{\rm{O}}_3} \downarrow + {\rm{C}}{{\rm{O}}_2} \uparrow + {{\rm{H}}_2}{\rm{O}}}\end{array}$