Depletion time is usually defined as the time it takes to use up ____% of the mineral reserves at a given rate of use.
A. 10
B. 40
C. 50
D. 80
E. 100
Answer: D
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Farming for the primary purpose of feeding one's family is known as
A) commercial farming. B) family farming. C) subsistence agriculture. D) small scale farming. E) targeted agriculture.
Heavy rains and mudslides cause a river to change course, isolating two groups of lizards of the same species from one another. Over a long period of time ________
A) the groups will probably diverge genetically, and speciation may occur B) one or both groups will probably become invasive species C) one group will probably become an endemic species D) both groups will probably become native species E) one or both groups will probably emigrate
Which of the following is the starting material derived from natural gas that is used for the production of ethylene?
A) acetylene B) benzene C) ethane D) methane
What are specific characteristics of an asteroid impact seen in rocks surrounding an impact crater? Discuss these characteristics and describe their formation and appearance
What will be an ideal response?