Final answer:
The carbon cycle involves the absorption of atmospheric carbon by plants during photosynthesis, movement through the ecosystem, and release by respiration and decomposition. The nitrogen cycle transforms atmospheric nitrogen into usable forms through fixation, and releases it back via denitrification. The water cycle moves water between bodies of water, atmosphere, and land through evaporation, precipitation, and transpiration.
Step-by-step explanation:
In the carbon cycle, carbon is absorbed from the atmosphere by plants during photosynthesis. This carbon is then used to build organic molecules that are essential for life. Carbon moves through various components of the ecosystem, including plants, animals, and decomposers, and is then released back into the atmosphere through processes like respiration and decomposition. Human activities, such as burning fossil fuels, also release carbon dioxide into the atmosphere.
The nitrogen cycle is more complex and involves several processes to convert atmospheric nitrogen into a form usable by living organisms. Nitrogen fixation by bacteria in the soil and in plant roots converts nitrogen gas into ammonium, which plants can then use. Decomposition also plays a role in returning nitrogen to the soil. Denitrification by other bacteria converts nitrates back to nitrogen gas, releasing it into the atmosphere.
The water cycle describes how water evaporates from bodies of water, turns into vapor in the atmosphere, and eventually returns as precipitation. Water is also taken up by plants through roots and lost to the atmosphere through transpiration. The cycle involves exchange pools such as the atmosphere and water reservoirs like oceans, aquifers, and ice masses.