The Earth's primordial atmosphere:
A) contained no oxygen.
B) was an effective filter that absorbed high-energy ultraviolet rays.
C) was mainly oxygen.
D) was formed by biological processes.
Correct Answer:
Verified
Q8: A first rapid increase of oxygen in
Q16: During the _, about 2.4 billion years
Q17: Acidity is expressed on the _ scale.
Q17: _ in the stratosphere absorbs ultraviolet radiation.
Q19: The major legislation that dictates federal air
Q22: The layer of air closest to the
Q23: The largest source of air pollutants in
Q24: James Lovelock used the term _ to
Q25: The Earth's modern atmosphere:
A) is composed of
Q26: The highest portion of the atmosphere that
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