An example of replenshible energy source is
1). Coal
2). Petroleum
3). Lignite
4). Biomass
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1. Which one of the following is known as the brown coal
2. Which of the following is used to remove rust stains on cloth?
3. Which of the following laser types is used in a laser printer?
4. Coating of solid waste with impervious material is known as
6. In chemical terms, what are alums used for purifying water for drinking purposes ?
8. Bleaching powder is used in drinking water as a/an