It is believed that at one time all of Earth's land masses were crowded together in one supercontinent, which is called Pangaea
a. True
b. False
Indicate whether the statement is true or false
True
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China is the world leader in grain and feed production
Indicate whether the statement is true or false
What steps are involved in having a hypothesis become an established theory?
A. A United Nations scientific panel votes on whether the hypothesis is accepted. B. The hypothesis makes sense when explained by politicians. C. The hypothesis is consistent with new data and investigations used to test its predictions. D. A U.S. government agency votes on whether the hypothesis is accepted.
The ozone "hole"
A) occurs the equatorial regions as a result of higher stratospheric temperatures. B) is a natural phenomenon resulting from the unequal distribution stratospheric oxygen. C) is a complex phenomenon in polar regions that results in the release of seasonally large amounts of chlorine, which breaks down ozone. D) usually forms over industrial areas during summer when large amounts of SOX and NOX are released into the atmosphere.
On this map of the South Atlantic, which letter is on a site of seafloor spreading?
A) A
B) B
C) C
D) D