In a wet and humid climate, the mineral halite will succumb to weathering more easily than granite because
A) granite is more resistant.
B) halite readily dissolves in water.
C) halite is relatively soft (hardness of 2.5).
D) all of the above.
Answer: D
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Radioactive Decay: Suppose the half-life of an isotope is 2 days. You purchase 10 grams of the isotope, but it was produced in a laboratory 4 days before it was delivered to you. How much of this isotope will you have 3 days after it was delivered to you?
A. more than 2.5 grams but less than 5 grams B. 2.5 grams C. more than 1.25 grams but less than 2.5 grams D. 1.25 grams E. less than 1.25 grams
The Heisenberg uncertainty principle places restriction on the precision of simultaneously measuring both position and momentum. This principle can also be applied to the simultaneous measurement of two other variables, which are:
a. mass and charge. c. force and color. b. torque and frequency. d. energy and time interval.
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Which of the following is true of rich galaxy clusters?
A) They primarily consist of irregular galaxies. B) More than 80 percent of their galaxies are spiral galaxies. C) Less than 20 percent of their galaxies are E and S0 galaxies. D) They often contain one or more giant elliptical galaxies at their centers.