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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.

  • Mass Extinctions Interactive

    Mass Extinctions Interactive

    Click & Learn

    Discover the environmental factors that caused the five big mass extinctions in Earth’s history and which species they impacted.

  • Dodging Extinction

    Dodging Extinction

    Lecture

    (31 min 12 sec) What steps can be taken to avoid the sixth mass extinction?

  • Humans, Biodiversity, and Habitat Loss

    Humans, Biodiversity, and Habitat Loss

    Lecture

    (33 min 4 sec) Human activities and their effects on biodiversity in the past, present, and future.

  • Learning from Past Extinctions

    Learning from Past Extinctions

    Lecture

    (29 min 6 sec) There is still time to avoid a sixth mass extinction.

  • In A Different Light

    In A Different Light

    Image of the Week

    A tree scorpion illuminated with UV light gives off a blue-green glow.

  • The Making of Mass Extinctions

    The Making of Mass Extinctions

    Poster

    Discover the environmental factors that caused the five big mass extinctions in Earth’s history and which species they impacted.

  • Anthony Barnosky and Kaitlin Maguire Measure Mammal Extinctions at the John Day Fossil Beds

    Anthony Barnosky and Kaitlin Maguire Measure Mammal Extinctions at the John Day Fossil Beds

    Scientists at Work

    (9 min 15 sec) Prehistoric extinction rates are calculated from fossil data in a paleodatabase and compared to today’s extinction rate.

  • Biodiversity in the Age of Humans

    Biodiversity in the Age of Humans

    Lecture

    Are we witnessing a sixth mass extinction? What factors threaten ecosystems on land and in the sea? What are researchers doing to try to conserve biodiversity and ecosystems?

  • Human Evolution Within the Tree of Life

    Human Evolution Within the Tree of Life

    Poster

    The poster from the 2011 Holiday Lectures on Science, Bones, Stones and Genes: The Origin of Modern Humans. It provides a unique look at the classic "tree of life" and features a timeline of various hominid fossils and their stone tool usage.

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