Mafic magma typically contains:
a) 25% silica
b) 50% silica
c) 75% silica
d) No silica at all
e) Some silica but there is insufficient data regarding this
Ans: b) 50% silica
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At what time of day is the relative humidity normally at a minimum?
a. when the air temperature is highest b. just before sunrise c. about midnight d. when the air temperature is lowest e. at sunset
At high altitudes atmospheric pressure is lower than at sea level. Which of the following is true?
A) Boiling water is cooler in Denver than in New York. B) Boiling water is hotter in Denver than in New York. C) Water boils at the same temperature in Denver and New York. D) We cannot predict the relationship between the boiling points in the two cities.
Soils are an important source of all of the following except
A. peat. B. kaolinite clay. C. aluminum. D. petroleum.
In a mercury barometer, when the air pressure increases, the mercury in the tube __________.
Fill in the blank(s) with the appropriate word(s).