The most important natural source for the formation of acid for rock weathering at the Earth's surface is dissolved ________.
A. hydrothermal effluent
B. seawater
C. carbon dioxide
D. mantle plumes
E. comets
Answer: C
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It is generally believed that vast areas of the continental crust known as shields have not been significantly changed for millions of years
Indicate whether the statement is true or false.
How do seasons affect the surface winds?
A) During the northern summer, the surface winds shift to the south. B) During the northern winter, the surface winds shift to the south. C) During the northern winter, the surface winds shift to the north. D) All of these choices
Fronts represent changing weather conditions
Indicate whether the statement is true or false
The number of incoming objects is related to their size; the ________.
A. number is the same for each size range B. larger the meteoroids, the greater their abundance C. smaller the meteoroids, the greater their abundance D. size is inversely proportional to the number