How is CNG obtained? What is its full form? Write the advantages of using CNG over petrol or diesel.

Explanation

### Step-by-Step Solution:

1. **Full Form of CNG**:
- CNG stands for **Compressed Natural Gas**.

2. **How CNG is Obtained**:
- CNG is derived from **natural gas**, which is found deep within the Earth, often in association with petroleum deposits.
- Natural gas is formed from the remains of dead vegetation and organisms that have been subjected to heat and pressure over millions of years.
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