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"By person" or "by people"? Generally speaking, a magnitude 1.0 earthquake on the Richter scale is detected by instruments but not by person.
Dec 29, 2015 6:39 AM
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Generally speaking, a 1.0 magnitude earthquake on the Richter scale can be detected by instruments, yet undetectable by human.
December 29, 2015
people
December 30, 2015
but not by people
December 29, 2015
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