The form of nitrogen that comprises 78% of atmospheric mass and is necessary for biological processes, but is unusable by plants, is

A) N2.
B) NOx.
C) N2O.
D) NO2.


A) N2.

Environmental & Atmospheric Sciences

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On the windward side of the mountain, should the relative humidity of the parcel change as it rises from 2000 m to 4000 m? Why?


Assume that condensation begins at 100% relative humidity and that no evaporation takes place as the parcel descends.

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Which of the following is believed to have been the world's most violent stage 1 epidemic?

A) HIV/AIDS B) The Black Plague C) Malaria D) Tuberculosis E) Mad cow disease

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Which base is an important starting material in the manufacture of fertilizers?

A) LiOH B) Mg(OH)2 C) NaOH D) NH3

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Eratosthenes' measurements of Earth's size involved

A. a deep well in Syene. B. surveying the distance between Alexandria and Syene. C. a pillar's shadow in Alexandria. D. all of the above

Environmental & Atmospheric Sciences