What is an atom that has lost or gained electrons?
A. ion
B. isotope
C. neutron
D. element
Answer: A
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Which would make the best aquifer?
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
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
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
About ____ of the world's human population lives in the developing countries
a. 20% b. 40% c. 60% d. 80% e. 90%