In terms of mineral resources, recycling is ________ as raw materials become more ________ and ________ are more plentiful.
A. Slowly increasing; scarce; wastes
B. Quickly decreasing; scarce; wastes
C. Staying about the same; expensive; environmental laws
D. Slowly decreasing; scarce; environmental laws
E. Quickly increasing; expensive; environmental laws
Answer: A
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Since the Clean Water Act of 1972, the quantities of nitrate and phosphate entering surface waters have
A. essentially remained the same. B. have decreased for point sources but not nonpoint sources. C. decreased significantly for both point and nonpoint sources. D. have decreased for nonpoint sources but not point sources.
Which mobile belts were involved in the collision between Gondwana and Laurasia during the Carboniferous period?
a. Taconic, Appalachian, Hercynian b. Taconic, Hercynian, Ouachita c. Hercynian, Appalachian, Ouachita d. Ouachita, Laramide, Sonoma e. Sonoma, Acadian, Taconic
The downslope movement of water-saturated surface sediment is called ____________________. Fill in the blank(s) with the appropriate word(s)
Of the 20 amino acids found in human proteins, how many are nonessential amino acids?
A) 5 B) 10 C) 15 D) 20