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Terrestrial Climate
Midcontinent Rift System


One billion years ago, the Earth's crust split across part of the North American continent. This tear or rift, known as the Midcontinent Rift System, extended for 950 miles from what is now Lake Superior to Oklahoma, and was on its way to becoming a full-fledged ocean when the process halted.  Credit: Raymond R. Anderson, Iowa Department of Natural Resources

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