More than ____percent of the total PM2.5 particles emissions across the United States in recent years have been attributed to emissions from wildland fires

a. ?2
b. ?5
c. ?10
d. ?25
e. ?50


ANSWER: c

Environmental & Atmospheric Sciences

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What will be an ideal response?

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The correct sequence of layers of the atmosphere from innermost to outermost is

a. mesosphere—stratosphere—thermosphere—troposphere b. troposphere—stratosphere—mesosphere—thermosphere c. stratosphere—thermosphere—troposphere—mesosphere d. thermosphere—stratosphere—mesosphere—troposphere e. thermosphere—mesosphere—stratosphere—troposphere

Environmental & Atmospheric Sciences

Which is a characteristic of a less developed country?

a. low percentage of population in agriculture b. high energy use c. low population growth rate d. high birth rate e. high amount of leisure time

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The lunar maria are large impact craters filled with ________

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences