What Caused the Catastrophic 1997 Flood Along the Red River

question 23

Multiple Choice

What caused the catastrophic 1997 flood along the Red River in North Dakota?

• A)thawing to the south of the frozen north-flowing river that backed up water behind the ice to the north
• B)thawing of a heavy snowpack on the nearly horizontal surface of ice-age Lake Agassiz
• C)heavy rains on a deep snowpack on nearly flat ground
• D)a stalled warm front that was unusually far north for that time of year
• E)a cold front from the north that intersected a warm front in the northern Mississippi valley

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