The Earth's modern atmosphere:
A) is composed of 78 percent nitrogen.
B) does not filter high-energy ultraviolet rays.
C) is similar to that found on Venus.
D) is composed of 80 percent oxygen.
Correct Answer:
Verified
Q8: A first rapid increase of oxygen in
Q21: The Earth's primordial atmosphere:
A) contained no oxygen.
B)
Q21: _ is the release of volatiles from
Q22: The layer of air closest to the
Q23: The largest source of air pollutants in
Q24: James Lovelock used the term _ to
Q26: The highest portion of the atmosphere that
Q27: During photosynthesis:
A) chlorophyll-bearing plants convert oxygen and
Q30: In the _, temperature increases with altitude,
Q30: _ were among the earliest photosynthetic life-forms
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