U.S. Geography

What rock was adopted as Missouri's official state rock in 1967?

More Questions from U.S. Geography
Which state is known as the "Keystone State" and includes Pittsburgh?
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What 24.5-acre park in downtown Chicago was opened to the public in 2004?
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What were there originally 86 of in North America?
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What is the highest mountain in Vermont?
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What interstate is located near the Delaware Water Gap?
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Which Spanish explorer visited the area that is now Tennessee in 1540?
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How many guest rooms are there in Michigan's Grand Hotel?
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Which U.S. state was named for William Penn?
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