Which of the following is a type of treatment of hazardous waste?
A. treatment of wastewater in a sewage treatment plant
B. deep-well injection in porous geological formations
C. storage in underground caverns and salt mines
D. All of these statements are correct.
Answer: A
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Hunters and gatherers, or foragers, did not modify their landscapes
a. True b. False Indicate whether the statement is true or false
A number of elements occur naturally as diatomic molecules under normal atmospheric conditions.. Which of the following does not occur naturally as a diatomic molecule?
A) chlorine B) hydrogen C) nitrogen D) sulfur
Volcano A erupts rocks with SiO2 content ranging from 49% to 52% whereas volcano B, 100km away, erupts materials with SiO2 content of 62-68%. Which statement best characterizes these two volcanos?
A) Volcano A is probably a shield volcano with typically quiescent eruptions, whereas Volcano B is likely a stratovolcano characterized by violent, explosive eruptions. B) Both volcanos are violent, explosive volcanos that spread ash continent wide. C) Volcano A is likely to be a supervolcano with violent eruptions, whereas volcano B is probably a shield volcano with quiescent eruptions. D) Both volcanos are shield type volcanos that are characterized by quiescent eruptions.
Curitiba, Brazil, has shown us that ________
A) traffic flows smoothly once pedestrians and bicycles are eliminated B) once roads are widened, traffic congestion decreases C) prohibition of motorized vehicles in urban reduces pollution and saves energy D) a walkable city center and expanded bus system can solve a large city's traffic congestion E) unregulated urban sprawl produces severe air pollution