Identify the true statement.
A. An earthquake of magnitude 6 has twice the amplitude of a magnitude 3 quake.
B. Large earthquakes occur more frequently than small ones.
C. An earthquake of magnitude 6 has 1,000 times the amplitude of a magnitude 3 quake.
D. The Mercalli scale is no longer used because it has been replaced by modern measures of earthquake magnitude.
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Identify the true statement.
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