If clay minerals in a sedimentary rock were buried at a depth where subsurface temperatures exceeded 200°C, which common metamorphic mineral would they become?

A) Quartz
B) Muscovite
C) Amphibole
D) Plagioclase


Answer: B

Environmental & Atmospheric Sciences

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A. is a reasonable option only in impoverished countries B. decreases biodiversity by causing increased speciation in environmentally sensitive areas C. increases biodiversity by providing income to areas that might otherwise be destroyed D. decreases biodiversity by selling souvenir organisms

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Indicate whether the statement is true or false

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Which one of the following is an ecosystem service?

A) global warming B) genetically modifying food C) erosion D) pollination of crop plants E) creation of pollution

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What is the ratio of sea to land on Earth?

A) 61: 39 B) 71: 29 C) 81: 19 D) 51: 49

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