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I have a picture that shows what scientists think parts of North America looked like 300 million yrs ago. ie, trees, plants , insects, rocks. How do scientists know what North America looked like so long ago, if there were no people around to see it?

  • science -

    Fossils. By studying fossils and also the geological record one can reconstruct how the Earth looked like.

    See also this program about the first trees:

  • science -

    Geologists, paleontologists, hydrologists, and others, study the landscape, the continental plates, fossils, etc and draw conclusions from those studies about various time frames.

  • science -

    Fossils and radioactive dating techniques. It is possible to assign an age to layers of earth at different depths.

  • science -

    how do we grow quickly do we grow

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