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When sharks swam the Great Plains

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If you’ve ever been to, lived in, or even flown over the central swath of North America, then you’ve seen the remnants of what was a uniquely fascinating environment. Scientists call it the Western Interior Seaway, and at its greatest extent, it ran from the Caribbean Sea to the Canadian Arctic.

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What was the Western Interior Seaway, and when did it exist?

a

A freshwater lake in North America during the Jurassic Period.

b

A shallow sea that split North America from about 95 to 68 million years ago.

c

An ice sheet covering North America during the Pleistocene Epoch.

d

A desert that spanned the central United States during the Triassic Period.

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