Question

how can i define water cycle,oxygen cycle, nitrogen cycle & carbon cycle in 1-2 sentences?

Answer 1

Water cycle is a process of continuos movement of water on, below and above the surface of earth.
Oxygen cycle is a process of circulation of oxygen from various biotic and abiotic forms of nature.
Carbon cycle is a process by which carbon compounds are interconverted in the environment.
Nitrogen cycle is a process by which nitrogen compounds are interconverted in the environment and living organisms.