In the 1970s the price of copper rose rapidly, but since then it has declined substantially. In what ways do these variations demonstrate the effect of substitutability on mineral resource use?
What will be an ideal response?
Answer: Once a suitable substitution for copper was economically viable, the demand for copper declined, making the copper more affordable.
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A 2009 study found that one-third of the world's 925 major rivers experienced reduced flow from 1948 to 2004, with the majority of the reduction attributed to ________
A) overuse by cities for drinking water B) municipalities diverting treated wastewater into artificial wetlands rather than the rivers themselves C) overuse for agriculture D) dredging operations that make the rivers navigable E) the effects of climate change
The ice of a glacier that is retreating is still moving forward. Indicate whether the statement is true or false
Which of the following is NOT a characteristic of Jupiter?
A. It is the largest planet in the solar system. B. Most of its outer parts are gas. C. It has a wide variety of geologically interesting moons. D. The atmosphere is nitrogen and oxygen, like the atmosphere of the Earth. E. It is farther from the Sun than Mars.
How do oxbow lakes form? What will be an ideal response?