Compaction of soil in a garden harms plants by ________
A) increasing aeration, increasing infiltration, and decreasing runoff
B) decreasing aeration, increasing infiltration, and decreasing runoff
C) decreasing aeration, decreasing infiltration, and increasing runoff
D) increasing aeration, decreasing infiltration, and increasing runoff
C
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In bombarding atomic nuclei with proton "bullets," the protons must be accelerated to high energies to make contact with the target nuclei
A. because the target nuclei are so small. B. because the target nuclei are positively charged. C. in order to penetrate through the electrons that surround each target nucleus. D. because the target nuclei are negatively charged.
Over the past 60 years, as people moved from U.S. cities to suburbs, the people that were left behind in the cities were primarily
A) older, poor people representing ethnic minorities. B) younger, wealthy people representing ethnic minorities. C) older and wealthy Caucasians. D) younger Caucasians.
The apparent westward "drift" of the planets compared to the background stars is called ________
A) retrograde motion B) occultation C) Ptolemaic motion D) precession
The boundary of a city is marked by a river. This is an example of which kind of boundary?
A. imposed B. natural C. antecedent D. geometric