Where is petroleum mainly found?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Petroleum**: Petroleum is a natural resource that is formed from the remains of ancient marine organisms. It is a crucial energy source and is used for various purposes, including fuel, lubricants, and raw materials for the chemical industry.

2. **Location of Petroleum Reserves**: Petroleum is primarily found in two main locations:
- **Beneath Land**: Large reserves of petroleum can be found deep underground in rock formations or associated with other geological structures.
- **Ocean Floor**: Significant amounts of petroleum are also located beneath the ocean floor, often in offshore oil fields.

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