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.
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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
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.
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
Which base is an important starting material in the manufacture of fertilizers?
A) LiOH B) Mg(OH)2 C) NaOH D) NH3