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#midcontinent rift
#science
#aulacogen
#geology
#precambrian
#laurentia
#north america
#rodinia
#plate tectonics
#large igneous province
#the earth story
#science
#geology
#north america
#midcontinent rift
#hotspot
#mantle
#lake superior
#basalt
#volcano
#precambrian
#crust
#plate tectonics
#aulacogen
#the earth story
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