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Air Pollution And Health Effects
Which pollutant from motor car exhaust causes mental disease?
Lead from motor vehicle exhaust, especially from leaded gasoline, is a neurotoxin that can cause mental diseases and cognitive impairments. Other pollutants listed do not primarily cause mental diseases.
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Bioenergy
Biomass can be converted into fuels by____________________?
Biomass can be converted into fuels through both direct combustion, which produces heat energy, and fermentation, which produces biofuels like ethanol. Therefore, both methods are correct.
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Earth Day
The first Earth Day was observed in the year:
The first Earth Day was observed on April 22, 1970, marking the beginning of the modern environmental movement. Although the question states April 20, the year 1970 is correct as the inaugural Earth Day year.