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

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.

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1) water cycle :-

The water cycle, also known as the hydrologic cycle or H₂O cycle, describes the continuous movement of water on, above and below the surface of the Earth. Water can change states among liquid, vapor, and solid at various places in the water cycle. Although the balance of water on Earth remains fairly constant over time, individual water molecules can come and go, in and out of the atmosphere. The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, runoff, and subsurface flow. In so doing, the water goes through different phases: liquid, solid, and gas.

2) Oxygen cycle :-

The Oxygen cycle is the biogeochemical cycle that describes the movement of oxygen within its three main reservoirs: theatmosphere (air), the total content of biological matter within the biosphere (the global sum of all ecosystems), and the lithosphere(Earth's crust). Failures in the oxygen cycle within the hydrosphere (the combined mass of water found on, under, and over the surface of a planet) can result in the development of hypoxic zones. The main driving factor of the oxygen cycle is photosynthesis, which is responsible for the modern Earth's atmosphere and life.

3) Nitrogen Cycle:-

The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out by both biological and non-biological processes. Important processes in the nitrogen cycle include fixation, mineralization, nitrification, and denitrification. The majority of Earth's atmosphere (approximately 78%) is nitrogen,^[1] making it the largest pool of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, includingprimary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.

4)Carbon Cycle:-

The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere,geosphere, hydrosphere, and atmosphere of the Earth. It is one of the most important cycles of the earth and allows for carbon to be recycled and reused throughout the biosphere and all of its organisms.^{[citation needed]}

The carbon cycle was initially discovered by Joseph Priestley and Antoine Lavoisier, and popularized by Humphry Davy.^[1] It is now usually thought of as including the following major reservoirs of carbon interconnected by pathways of exchange:

The atmosphere
The terrestrial biosphere, which is usually defined to include fresh water systems and non-living organic material, such as soil carbon.
The oceans, including dissolved inorganic carbon and living and non-living marine biota,
The sediments including fossil fuels.
The Earth's interior, carbon from the Earth's mantle and crust is released to the atmosphere and hydrosphere by volcanoes and geothermal systems.

The annual movements of carbon, the carbon exchanges between reservoirs, occur because of various chemical, physical, geological, and biological processes. The ocean contains the largest active pool of carbon near the surface of the Earth, but the deep ocean part of this pool does not rapidly exchange with the atmosphere in the absence of an external influence, such as a black smoker or an uncontrolled deep-water oil well leak.

The global carbon budget is the balance of the exchanges (incomes and losses) of carbon between the carbon reservoirs or between one specific loop (e.g., atmosphere ↔ biosphere) of the carbon cycle. An examination of the carbon budget of a pool or reservoir can provide information about whether the pool or reservoir is functioning as a source or sink for carbon dioxide.