PM10 (coarse particulate matter) levels in the United States have ________ between 1990 and 2015.
A. decreased by 39%
B. remained constant
C. decreased by 95%
D. increased slightly
Answer: A
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In North America the highest potential for large tsunamis is in the coastal regions of ____
A) the Pacific Coast and Hawaii B) the Hudson Bay C) Louisiana D) the eastern seaboard
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Indicate whether the statement is true or false
When Aldo Leopold said, "The first rule to intelligent tinkering is to save all the pieces." In terms of biodiversity he meant that we should
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