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Joan Cartan-Hansen, Host: The

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Earth's crust is made up of lots

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of sections called plates.

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And during the time dinosaur

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roamed the earth, the surface of

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our planet looked very

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different.

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When dinosaurs first appeared in

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the Triassic period, all the

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world's land were joined

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together in a super continent

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called Pangaea.

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In the Jurassic period, the land

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mass had split into two

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continents: Gondwana and

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Laurasia.

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And in the Cretaceous period,

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the land masses we know today

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were starting to appear.

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With everything we've learned

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about dinosaurs, there are still

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some things we don't know.

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We don't really know what

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dinosaurs sounded like.

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We don't know what colors

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dinosaurs were except for the

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Sinosauropteryx.

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It was orange with white rings

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down its tail.

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And we don't know how many

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dinosaurs there really were.

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But that's okay.

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It gives us a chance to learn

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more.

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Check out the science trek

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website for more information

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about this and all our science

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topics for kids.

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You'll find it at

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ScienceTrek.org

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