Of the six major pollutants tracked by the EPA, which has had the least progress made on reducing ground level amounts?

What will be an ideal response?


Ozone

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Wood or steel frames installed between inner and outer wall forms to create window or door openings are called _____.

a. spacers b. holdouts c. bucks d. lintels

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To enhance the strength of the soil and give it cement-like properties, fly ash is mixed with _____.

a. lime b. water c. portland cement d. chemical binders

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Since the 1960s, the number of horses and mules in the United States has _____

A) decreased B) increased C) remained about the same D) almost disappeared

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A waste-spark-type ignition system fires ________

A) One spark plug with straight polarity B) One spark plug with reverse polarity C) Two spark plugs at the same time D) All of the above

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