Where is natural gas most commonly found?

Explanation

### Step-by-Step Solution:

1. **Understanding Natural Gas**:
- Natural gas is a type of fossil fuel primarily composed of methane, along with other gases like nitrogen, carbon dioxide, propane, and ethane.

2. **Formation of Natural Gas**:
- Natural gas is formed from the remains of dead organisms (plants and animals) that have been buried under layers of earth for millions of years.
- The conditions necessary for this transformation include high pressure, absence of air, and absence of sunlight.
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