The major reservoir of carbon on earth is_________

Explanation

**Step-by-Step Solution:**

1. **Identify the Major Reservoirs of Carbon:**
- There are four major reservoirs of carbon on Earth:
1. Rocks (including fossil fuels)
2. Ocean water (where carbon is dissolved)
3. Biosphere (including plants, animals, and soil)
4. Atmosphere (in the form of gases)
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