Some metamorphic rocks are potential environmental hazards because
A) foliation can represent a plane of weakness in the rock
B) the fluids that metamorphose the rocks can leave behind dangerous chemicals
C) they are composed of unstable elements
D) the crystals do not interlock as in igneous rocks
A
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Which lettered point has the lowest elevation?
The question is based on this contour line map with elevations shown in feet.
• North is to the top of the map.
• Streams are shown with dashed lines.
• A graphic scale for measuring horizontal distances is shown below the map.
• Estimate elevations between contour lines to the nearest half-contour interval; assume that the top of a
hill is one-half-contour interval higher than the highest contour line shown.
What will be an ideal response?
The huge dust storms that took place in the United States in the 1930s ________
A) were the result of poor farming techniques B) were the result of polar cells C) were the result of ozone depletion D) were triggered by tornados, worsened by global climate change E) were the result of glacier melt
Which of the following is not an example of methods used for short-term climate reconstructions?
A) cave formation (speleothem) analysis B) ocean sediment core analysis C) dendrochronology D) lake core analysis E) carbon isotope analysis
Which of the following is not a major challenge to the widespread use of renewable energy?
A) Consumers often have limited knowledge about the source of their electricity. B) Government subsidies for fossil fuels reduce incentives for the use of renewable energy. C) The cost of production of these new technologies is high. D) Renewables cannot produce enough energy to meet demand E) There are uncertainties and risk associated with investing in new technologies.