The infectious disease that poses the greatest risk of death for people living in northern Eurasia and Africa is
A) tetanus.
B) measles.
C) tuberculosis.
D) hepatitis.
C
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The largest zone of Earth's interior, by thickness, is the
A. mantle B. outer core C. crust D. inner core
An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration
A) quadruples. B) doubles. C) stays the same. D) halves. E) none of the above
Which of the following gases accounts for about 78 percent of the atmosphere's mass?
a. water vapor b. nitrogen c. ozone d. carbon dioxide
Atmospheric brown clouds are ____.
A. large clouds of dust, smoke, soot, and toxic metals B. primarily found in Western Europe C. slow moving clouds from wildfires D. only a problem in China E. produced by volcanic eruptions