The three crops that humans rely on for the majority of nutrients and calories are

A. Oats, beans, and barley
B. Potatoes, wheat, and oats
C. Barley, oats, and rye
D. Maize, oats, and rice
E. Wheat, rice, and maize


Answer: E

Environmental & Atmospheric Sciences

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The residence time refers to the average length of time that a drop of water remains

A) intact before the hydrogen and oxygen atoms split. B) in its store. C) in motion without being stuck in a store. D) unpolluted by human activities.

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What texture is displayed by the igneous rock in this photograph?



A) Vesicles
B) Breccia
C) Porphyritic
D) Glassy
E) None of these are correct.

Environmental & Atmospheric Sciences

The oxygen, O2, and hydrogen sulfide, H2S, molecules are about the same size and they also have about the same degree of polarity. This helps to explain why

A) the body survives when breathing H2S just about as well as it does when breathing O2. B) H2S is such a smelly compound while O2 has no smell. C) the Earth's ancient atmosphere was once abundant with H2S. D) cells absorb H2S just as easily as they absorb O2.

Environmental & Atmospheric Sciences

There are no sediments on the deep seafloor

Indicate whether this statement is true or false.

Environmental & Atmospheric Sciences