What era is known for Iowa being covered by a tropical sea?

• Cretaceous period

• Jurassic period

• Devonian period

• Triassic period

What geological process led to the formation of mountains and the deposition of lime mud?

• Erosion

• Volcanic activity

• Meteor impacts

• Plate tectonics

In what year did the Coralville Dam first begin holding water?

• 1938

• 1958

• 1947

• 2001

What was the peak lake level during the 1993 flood?

• 683 feet

• 716.71 feet

• 711.4 feet

• 700 feet

What natural event in 2008 caused the water to flow over the spillway again?

• Snowmelt

• Earthquake

• Drought

• Heavy rainfall