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  • EarthViewer

    EarthViewer

    Click & Learn

    Download the accompanying student worksheet under "Downloads." What did Earth look like 250 million years ago? Or 1 billion years ago? Or 4.5 billion years ago? EarthViewer is an interactive tool that allows you to explore the science of Earth's deep history.

  • The Shy Shark's Secret

    The Shy Shark's Secret

    Image of the Week

    The Chain catshark (Scyliorhinus retifer) fluoresces bright green when illuminated in blue light.