Slow movement of an element from the environment, through food webs, then back to the environment: The biogeochemical cycle refers to the chemical interplay that takes place between the atmosphere, hydrosphere, the lithosphere, and the biosphere.

A material cycle in which carbon flows through an ecosystem: In his textbook, Jim read about carbon cycles that included the process of decomposition, respiration, carbonification. and photosynthesis.

A period of nineteen years after which the phases of the Moon reoccur on the same days of the year: After the span of 19 years, the lunar calendar starts on the same date based on the Metonic cycle.

A series of four or five eclipses also occur on the same dates after this interval.