Wind, solar and geothermal power are called renewable energy sources because _______.
Which of the following is not a technological way of improving air quality?
Acid rain is the direct result of acid released by burning fossil fuels.
Which alternative energy source would be expected to be the least dependent upon the weather?
The best method to improve air quality is to _______.
Walking to work is one way of helping improve air quality.
Humans are not the only animals that pollute the air.
The principal source of air pollution from volcanoes is _______.
Driving cars lowers the pH of the oceans by _______.
Which of the following is not a source of air pollution related to human activities?
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