Oxygen (O²)
A) is a gas which principally originates from volcanic sources.
B) is a by-product of plant-leaf operations that are stimulated by light.
C) is one of the gases from Earth's earliest atmospheres.
D) is now measured at 78.084% by volume in the homosphere.
E) exists in quantities in the atmosphere which are in danger of becoming depleted.
Correct Answer:
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Q19: The ionosphere
A)primarily absorbs harmful infrared wavelengths.
B)allows all
Q20: The thermopause refers to
A)Earth's magnetic field.
B)the solar
Q21: The two most abundant gases in the
Q22: Temperatures increase with increasing altitude in
Q23: Nitrogen (N²)is
A)a by-product of photosynthesis.
B)relatively inert,with cycling
Q25: Which of the gases listed below has
Q26: Which gas in the atmosphere is used
Q27: The percentages of variable gases in the
Q28: Which of the following is true regarding
Q29: Which is true of the amount of
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