In Appalachia, many miners are out of work because ________
A) coal extraction has decreased because the region is beginning to run out of coal
B) they were fired for protesting mountaintop removal
C) mountaintop removal is highly mechanized, and thus they are not needed
D) of local protests that shut down mining operations
E) of a moratorium on mountaintop removal
C
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Why does oxygen have such a low solubility in water?
A. Water's attraction for itself is stronger than its attraction for oxygen molecules. B. Water and oxygen only attract one another by means of weak dipole-induced dipole attractions. C. The hydrogen bonding in water keeps the oxygen solubility low. D. Both A and B are true.
Temperature differences between nighttime and daytime on Earth are relatively small due to
A. seasonal fluctuations and Earth's magnetic field. B. polar regions absorbing most solar energy. C. Earth being 70% water. D. Earth's relatively high daily spin rate and shortness of nighttime.
A wet-bulb thermometer and a dry-bulb thermometer are both parts of which meteorological instrument?
A) an anemometer B) a sling psychrometer C) a thermistor D) a barometer
Which of the following factors least directly influences infiltration capacity?
A) Slope of the land B) Nature of the vegetative cover C) Rainfall intensity D) Prior wetted condition of the soil E) Ambient temperature