Which of the following is not one of the principal categories of rock-forming minerals?
A) Native elements
B) Halides
C) Peptides
D) Sulfides
E) Oxides
Answer: C
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Environmental protection has been proven to ________ the number of available jobs because ________.
A. Stabilize; the use of nonrenewable resources is stabilized, and jobs are scarce anyway B. Stabilize; it limits the use of nonrenewable resources (as in the case of the logging industry) C. Decrease; it limits the use of nonrenewable resources (as in the case of the logging industry) D. Decrease; it negatively affects economic growth E. Increase; labor is usually substituted for natural resources (as in the case of recycling)
What were the desert valleys of the Great Basin like 17,000 years ago? What does the distribution of the ice-age lakes in the Great Basin reveal about the climate 20,000 years ago?
How do we reconstruct ancient climate in this region? Where was the southerly track of northern winter storms during this time period? What will be an ideal response?
Unless major steps are taken quickly in ocean preservation and fishing limits, it is predicted that there will be a "global collapse" of all species currently fished by the year 2050
Indicate whether the statement is true or false
Which of the following characterizes the history of impacts on Earth as deduced by impact history on other terrestrial planets?
A) Impact rates were very high in the early history of the earth, but dropped off after about the first 1 billion years of Earth history to a nearly constant rate since that time. B) Impacts were more intense in the early history of the earth but have continued at about half the rate of bombardment since about 4.4 billion years ago. C) Impacts continued at a fairly constant rate throughout the 4.5 billion year history of the solar system. D) All major impacts occurred in the first 100 million years after the solar system formed.