Nitrogen (N²) is
A) a by-product of photosynthesis.
B) relatively inert,with cycling in the environment keyed to the activity of bacteria.
C) a product of the radioactive decay of a form of potassium in the crust.
D) now measured at 20.946% by volume in the homosphere.
E) is not needed to support life on Earth.
Correct Answer:
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Q18: The heterosphere is the layer of the
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
Q24: Oxygen (O²)
A)is a gas which principally originates
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
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