ANSWERS: 2
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During the New Madrid earthquakes of 1811-1812 that measured at least a magnitude of 8.0. It also caused some of the river to flood an area and form a lake called Reelfoot Lake, which is near my hometown in Tennessee.
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Three earthquakes in 1811 and 1812, estimated at approximately 8 on the Richter Scale, were said to have temporarily reversed the course of the Mississippi.
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