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
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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
In your own words, explain how astronomers determined that the universe is expanding
What will be an ideal response?
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
The lunar maria are large impact craters filled with ________
Fill in the blank(s) with correct word