The major reservoir of carbon on earth on earth is ...............

Explanation

**Step-by-Step Solution:**

1. **Understanding Carbon Reservoirs**: The question asks about the major reservoir of carbon on Earth. Carbon exists in various forms and locations, including the atmosphere, oceans, soil, and living organisms.

2. **Identifying Common Carbon Reservoirs**: Common reservoirs include:
- Atmosphere (as carbon dioxide, CO2)
- Oceans (dissolved CO2 and in marine organisms)
- Soil (organic matter)
...