Pieces of bedrock from Canada, north of Lake Superior, are spread across large areas of Wisconsin and Minnesota in the US, even though Lake Superior sits between the Canadian source of the rocks and the US places that the rocks now are. How do geologists explain this? A) The rocks floated into the US from Canada in icebergs during a great flood. B) The rocks were "splashed" into the US from Canada by a meteorite impact that formed Hudson Bay. C) The rocks were carried into the US from Canada by a glacier flowing from Canada; the base of the ice was able to flow uphill from Lake Superior into Minnesota and Wisconsin because the upper surface of the ice sloped down from Canada toward Minnesota and Wisconsin. D) The rocks were carried into the US by ice but before Lake Superior was formed, because ice cannotflow uphill.
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