Cyclic process

geochemical cycle human sexual response cycle eclipse cycle hermeneutic circle business cycle carbonate–silicate cycle seasonality Calvin cycle saros series proton–proton chain reaction sleep cycle cardiac cycle records life-cycle catalytic cycle intelligence cycle Leverage cycle scrum sprint liturgical season project life cycle Control loop charge cycle credit cycle Decision cycle Learning cycle ozone-oxygen cycle Oscillation thermodynamic cycle plan, do, check, adjust biogeochemical cycle Nuclear fuel cycle loop supercontinent cycle