It took more than 100 years for the world’s population to double from 1 billion to 2 billion. How long did it take for the world’s population to increase from 4 billion to 5 billion?

a) Fewer than 15 years as the result of exponential growth
b) Half the time of the first doubling, about 50 years
c) More than 100 years; 1 billion people are added each 100 years
d) The world’s population has not yet reached 5 billion


a) Fewer than 15 years as the result of exponential growth

Environmental & Atmospheric Sciences

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What type of metamorphic rock forms in large volumes associated with tectonic processes like mountain building or subduction zones?

A. contact metamorphic B. non-foliated metamorphic C. hydrothermal metamorphic D. foliated metamorphic E. regional metamorphic

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Fill in the blank(s) with the appropriate word(s).

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Answer the following statement true (T) or false (F)

Environmental & Atmospheric Sciences