A. Answer the following in brief.
1. What are the three grades of coal?
2. Name the by-products of petroleum.
3. Define fossil fuels.
4. Why hydroelectricity is a renewable energy resource?
5. How do we reduce the use of thermal power?
1. What are the three grades of coal?
2. Name the by-products of petroleum.
3. Define fossil fuels.
4. Why hydroelectricity is a renewable energy resource?
5. How do we reduce the use of thermal power?
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Verified answer
Answer:
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite.