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1. Producer gas is a mixture of and
2. is known as marsh gas.
3. The term petroleum means .
4. Heating coal in the absence of air is called.
5. An example for fossil fuel is .
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2. is known as marsh gas.
3. The term petroleum means .
4. Heating coal in the absence of air is called.
5. An example for fossil fuel is .
Register for free to see more content