A ____________________ rock forms when a pre-existing rock is subjected to high temperatures, high pressures, chemically active fluids, or a combination of these agents.
Fill in the blank(s) with the appropriate word(s).
Right answer summary: metamorphic
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Hydropower
A. provides about 90% of the electricity in Europe. B. is most important in rivers and streams. C. uses the potential energy of large standing water bodies to produce electricity. D. can emit methane from the decomposition of submerged vegetation in reservoirs. E. is expected to grow in large-scale plants in the future.
Which of the following describes an example of living sustainably?
A. A city lives at its biocapacity and consumes natural capital without replenishment. B. A city lives off of its natural income and preserves and replenishes natural capital. C. A city relies heavily on fossil fuels. D. A city has a substantial recycling program even though it generates far more waste than it recycles. E. A city uses natural capital and renewable resources with a rapidly growing ecological footprint.
When studying climate, which of these would be considered an example of the macro scale level?
a. New York City b. Cook County, Illinois c. the Amazon Basin d. the underside of a leaf e. the north side of a hill
This map shows contours of the water table, the location of four factories (labeled A, B, C, and D), and contaminated (x) and uncontaminated (-) wells. Which way will the contamination flow? 
A. south and southwest, down the contours B. northwest and southeast, parallel to the contours C. impossible to tell because the movement of contamination is independent of groundwater D. north and northeast, up the contours