Which of the following is not a commercial source of energy?
Firewood
Coal, petroleum, and natural gas are all fossil fuels, extracted and processed for commercial use. They are bought and sold on energy markets. Firewood, on the other hand, is typically gathered or harvested for personal use or small-scale, non-commercial applications. While it can be a source of energy, it's not generally considered a commercial energy source in the same way as the others.
Idex, a pain relief balm, has the smell of ________.
Which of the following is usually not an air-pollutant?
Idex, a pain relief balm, has the smell of ________.
Which of the following is usually not an air-pollutant?