When Coal Burns, Some Minerals Escape from the Chimney as ____________________

Q60: Donora-type incidents in the United States have

Q61: Chlorofluorocarbons are compounds that react with _.<br>A)

Q62: _ reacts in moist air to produce

Q63: Little radiation is absorbed in the _

Q64: The most abundant constituent of our atmosphere

Q66: What was James Lovelock's hypothesis?

Q67: During the _, about 2.4 billion years

Q68: Without an atmosphere, describe what the Earth

Q69: When did cyanobacteria first begin producing oxygen?

Q70: The layer of air closest to Earth,