Which laboratory equipment is needed to prepare solutions of known %(w/v)?
A) a balance
B) a volumetric flask
C) both a and b
D) Neither a nor b
C
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Does the average distance that a neutron travels through fissionable material before escaping increase or decrease when two pieces of fissionable material are assembled into one piece? Does this assembly increase or decrease the probability of an explosion?
A. The average distance decreases, while the probability of an explosion decreases. B. The average distance increases, while the probability of an explosion also increases. C. The average distance increases, while the probability of an explosion decreases. D. The average distance decreases, while the probability of an explosion increases.
Which of the following are characteristics typical of volcanic domes?
A) Steep-sided B) Rubble-covered surface C) Often occur in clusters D) All of these are correct.
Standard provisions of structural adjustment programs include all of the following
a) reduction of education and public services. b) increased subsidies. c) liberalization of trade. d) emphasis on export crops.
Robert Constanza and his colleagues have shown that ________
A) the value of ecosystem services is more than $48 trillion in 2013 dollars B) ecosystems services cannot be assigned monetary values because they are external C) ecosystem services are valued at less than 0.5% of the U.S. GDP D) nutrient cycling is the least valuable of ecosystem services E) NAFTA has had environmental benefits worth $2.7 billion in 2011