Which of the following is not a very long-lived, radioactive isotope?
A) Rb-87 B) K-40 C) C-14 D) U-238
C
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Tree harvesting by clear-cutting
a. cuts all trees in an area, leaving only stumps. b. cuts most trees but leaves some to produce seeds. c. cuts most trees but leaves some to shelter seedlings. d. produces uneven-aged tree stands.
Full-cost pricing would discourage producers from inventing more resource-efficient methods of production, thereby cutting production costs.
Answer the following statement true (T) or false (F)
Oxygen, silicon and aluminum are the three most abundant chemical elements within earth's crust. Why, then is aluminum recycled?
A. even though aluminum is abundant in the crust, most of it is within seafloor crust and consequently difficult to obtain B. to reduce the consumption of electrical energy relative to that which is needed to extract aluminum from ore C. because aluminum is a precious metal D. All of these reasons are true.
The plate boundary on the this figure is located between:
A. B and C B. C and D C. A and B D. D and E E. There is not enough information to tell.