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
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Freezing rain is likely to occur in this sequence when a warm front passes:
A. snow, sleet, freezing rain, rain. B. rain, freezing rain, sleet, snow. C. snow, freezing rain, rain, sleet. D. freezing rain, snow, rain, sleet.
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
A population is a group of __________.
Fill in the blank(s) with the appropriate word(s).
83% of the energy used in the U.S. comes from renewable energy sources.
Answer the following statement true (T) or false (F)