An earthquake of magnitude 9.0 on the Richter scale would be
(a) a mild earthquake
(b) a moderate earthquake
(c) a major earthquake
(d) a severe earthquake
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1
Answer:
A magnitude 9.0 earthquake can last for five minutes or longer, and the amount of energy released is about 1,000 times greater than that of a 7.0. According to the U.S. Geological Survey, the most powerful quakes could leave few if any masonry buildings standing, destroy bridges and toss objects into the air.
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Answer:
Magnitude Earthquake Effects Estimated Number Each Year
2.5 or less Usually not felt, but can be recorded by seismograph. 900,000
2.5 to 5.4 Often felt, but only causes minor damage. 30,000
5.5 to 6.0 Slight damage to buildings and other structures. 500
6.1 to 6.9 May cause a lot of damage in very populated areas.
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