U.S. Geography

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

More Questions from U.S. Geography
In which U.S. state will you find the cities of Des Moines, Cedar Rapids, Davenport and Sioux City?
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Where in the U.S. would you find area code 201?
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Which service was first established in Cincinnati in 1865?
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What is intersection of interstate highways I-25 and I-70 called in Denver?
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What is the deepest U.S. lake which is located in Oregon?
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Which soft drink was invented in St. Louis?
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The Hormel Company marketed the first canned ham in 1926 in what Minnesota city?
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The Missouri Compromise admitted Missouri to the United States under what condition?
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