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2 answers

6.0-6.9 = about 180 per year
7.0 - 7.9 = less than 20 per year
8.0 and greater = 1-3 per year

2007-11-14 03:39:10 · answer #1 · answered by Lady Geologist 7 · 0 0

look here:

2007-11-14 11:41:04 · answer #2 · answered by Marty_d 2 · 0 0

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