Briefly describe the principle of a psychrometer
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A psychrometer is used to determine the moisture content of the air using wet-bulb and dry-bulb thermometers. The dry-bulb thermometer measures air temperature. The wet-bulb thermometer has a cloth wick that is saturated with water, and when a current of air passes over it, the water evaporates. As it evaporates, the water absorbs heat energy, causing the temperature to drop. The amount of cooling is directly proportional to the dryness of the air, as drier air will result in a larger amount of evaporation and resultant cooling. Therefore, the larger the difference in the wet-bulb and dry-bulb temperatures, the lower the relative humidity.
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Which of the following statements concerning unconfined aquifers on barrier islands and atolls is correct?
A) Any salty water in the aquifer will rise if the water table is lowered by pumping. B) The water table must be 40 feet above sea level to keep the salty water in the aquifer below sea level. C) Wells drilled below sea level will produce only saline water. D) Pumping freshwater from one, large capacity well is much less likely to cause salty water to rise in the aquifer than pumping from several, widely spaced, smaller capacity wells.
Migration from rural to urban areas began in the 1800s in Europe and North America as part of the ________
A) Civil war B) Industrial Revolution C) Deforestation D) Agricultural Revolution E) None of these answer choices are correct.
What are the dominant geologic events in North America during the Paleozoic, Mesozoic, and Cenozoic eras, and how do these events relate to plate tectonics?
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Which of the following types of orbitals come in sets of seven?
A) s B) p C) d D) f