capture zonecarbon cyclecarbon dioxidecarbon monoxidecarbon organic nitrogen ratiocarbon tetracholoridecarbonate hardnesscarbonated springcardinalcardinal utilitycarry digitcarrying capacitycascadecascade overflow designcascade spillwaycase studycash cropcasingcatabatic windscatagenesiscataractcataract actioncatastrophic erosioncatch cropcatch watercatchmentcatchment dividecatchment geomorphologycatchment hydrologycatchworkcategorycatenacation exchange capacitycattle tarracecaulkcausewaycaven flowcaven watercavingcavitationcavitation damagecavitation numbercavitycawusceilingceleritycelerityo of wavecelsius degreecelsius temperature scalecelsius thermometer