When coal burns, some minerals escape from the chimney as ____________________, which settles as gritty dust.
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Q9: The layer of air closest to Earth,
Q10: _ were the earliest photosynthetic life-forms on
Q11: A rapid rise in oxygen levels occurred
Q12: The pressure exerted by air is the
Q13: _ are compounds that rise into the
Q15: _ reacts in moist air to produce
Q16: During the _, about 2.4 billion years
Q17: _ in the stratosphere absorbs ultraviolet radiation.
Q18: A toxic _ is a byproduct of
Q19: The major legislation that dictates federal air
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