3. In 1935 Charles Richter defined the magnitude of an earthquake to be M = log(I)- log(I), where M is the magnitude of the earthquake, I is the intensity of the earthquake, and Io is the intensity of a standard earthquake or benchmark earthquake. Write the formula for the magnitude of an earthquake as a single logarithmic function. What is the Richter scale rating of an earthquake for which I = 1000I?

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