Considering the cost-effectiveness of pollution control over a 25-year period, the most expensive period of pollution control is from years
A) 0 to 5 while the least expensive is in years 20 to 25.
B) 0 to 5 while the least expensive is in years 5 to 10.
C) 20 to 25 while the least expensive is in years 0 to 5.
D) 10 to 15 while the least expensive is in years 15 to 20.
A
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The brain drain
A) is when highly centralized governments actively recruit the best and the brightest individuals for jobs in the national capital, leaving few behind in the villages. B) is the selective practice of only providing males education after primary school. C) occurs when bright young people migrate to foreign lands in search of better jobs. D) is the practice of providing scholarships to students in poor countries, enabling them to study abroad and gain a better education which later upon their return they can utilize their skills in their homeland. E) occurs in extremely poor nations where there schooling is limited thus preventing school-age children from reaching their potential.
Which statement about the properties of Earth’s crust is true at subduction zones?
a. Ocean crust is subducted because it is lighter than continental crust. b. Continental crust is subducted because it is lighter than ocean crust. c. Ocean crust is subducted because it is thicker than continental crust. d. Continental crust is subducted because it is colder and denser than ocean crust. e. Ocean crust is subducted because it is colder and denser than continental crust.
Which of the following does not describe the number of other atoms a carbon atom can be bonded to?
A. only 5 B. only 2 C. only 3 D. only 4
Which parameter makes it possible to determine the direction groundwater is flowing in the subsurface?
A. Hydraulic porosity B. Hydraulic gradient C. Hydraulic conductivity D. Hydraulic pressure