In the water cycle, water changes between its various phases (solid, liquid and gas), but always stays water. In the case of the carbon and nitrogen cycles, various chemical forms of carbon (carbon dioxide, carbonates, sugars, etc.) and nitrogen (ammonia, nitrite and nitrate) are cycled through regularly.
When organisms die, decomposers in the ocean or soil break them down. Nitrogen in the soil or water is used again by living things. A small amount is returned to the atmosphere by certain bacteria that can break down nitrogen compounds into nitrogen gas. ... Show three ways in which water moves through the cycle.