Oxygen (O2) is
A) a by-product of photosynthesis.
B) now measured at 78.084% by volume in the homosphere.
C) one of the gases from Earthʹs earliest atmospheres.
D) a gas which principally originates from volcanic sources.
Correct Answer:
Verified
Q112: In 1974,Dr.Rowland and Dr.Molina made what observation
Q113: The ozonosphere is critical to life because
Q114: Which of the following is TRUE of
Q115: Nitrogen (N2)is
A)a product of the radioactive decay
Q116: About half of Earthʹs crust consists of
Q118: The three stable (i.e.,nonvariable)gases in the atmosphere,in
Q119: Which of the following is NOT true
Q120: Which stable (nonvariable)gas in the atmosphere is
Q121: Why is stratospheric ozone loss a concern?
A)Stratospheric
Q122: Which atmospheric zone supports the biosphere and
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