Hello,

1. Global Carbon Cycle refers to the exchanges of carbon within and between  biosphere, pedosphere, geosphere, hydrosphere and atmosphere.

2. Carbon may be transferred from one reservoir to another in seconds.

3. The main components of Global Carbon Cycle are  the atmosphere, the oceans, land, and fossil fuels.

4. The Global Carbon Cycle is important for the following reasons-

• Carbon forms the structure of all life on the planet, making up ∼50% of the dry weight of living things
• The cycling of carbon approximates the flows of energy around the Earth
• Carbon forms the most important Green House gases

5. The Cycle takes place by various mechanisms. One of the example is:

In the food chain, plants move carbon from the atmosphere into the biosphere through photosynthesis. They use energy from the sun to chemically combine carbon dioxide with hydrogen and oxygen from water to create sugar molecules. Animals that eat plants digest the sugar molecules to get energy for their bodies. Respiration, excretion, and decomposition release the carbon back into the atmosphere or soil, continuing the cycle.

Best Wishes.