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.

Correct option is C

Explanation:

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.

Ice or pancake batter, or any pile, tends to spread from where its upper surface is high to where its upper surface is low. The Great Lakes are old features, but the base of the ice really did flow up out of the Great Lakes into the US because the top of the ice sloped down from Canada into the US.

D

Explanation:

About 10,000 years ago, there was glaciation in Wisconsin,  ice of 2km thickness covered the region. The land features known today were carved by the the movement of the ice sheet. The ice sheet retreat left clay, gravel, sand, and boulder deposits. The glacial water became Lake Minong which was a precursor to Lake Superior.