Describe carbon cycle.

Explanation

### Step-by-Step Solution for the Carbon Cycle

1. **Definition of the Carbon Cycle**: The carbon cycle is a natural process that describes how carbon atoms move through the environment. It involves the continuous movement of carbon between the atmosphere, land, water, and living organisms.

2. **Carbon Release into the Atmosphere**: Carbon enters the atmosphere primarily through two main processes:
- **Decomposition**: When organisms die, their bodies decompose, releasing carbon back into the atmosphere.
- **Combustion**: Burning fossil fuels (like coal, oil, and natural gas) and biomass (like wood) also releases carbon dioxide (CO2) into the atmosphere.

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