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The theory of plate tectonics explains how large pieces of Earth's crust, called tectonic plates, move and interact. According to the theory, the movement of tectonic plates forms _____ creates volcanoes, and causes earthquakes.
|Question 17Verbal
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Which choice completes the text so that it conforms to the conventions of Standard English?
mountains:
A
mountains
B
mountains,
C
mountains;
D