What is an atom that has lost or gained electrons?

A. ion
B. isotope
C. neutron
D. element


Answer: A

Environmental & Atmospheric Sciences

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A. clay in the zone of saturation B. sandstone in the zone of saturation C. unfractured granite in the zone of saturation D. gravel in the zone of aeration

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Which of the following two stick structures are different conformations of the same molecule?

A. b and d B. a and d C. b and c D. a and c E. none of the above

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An outflow boundary is

A) the leading edge of cold air from a thunderstorm downdraft. B) a favorable place for future severe storm development, especially if two intersect. C) can be clearly seen on radar images. D) all of these

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About ____ of the world's human population lives in the developing countries

a. 20% b. 40% c. 60% d. 80% e. 90%

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