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National Museum of Natural History

Smithsonian Geologist Liz Cottrell answers your questions in the National Museum of Natural History’s YouTube series, “The Doctor Is In.” (Smithsonian Institution)

How to Identify Rocks and Other Questions From Our Readers

Smithsonian Geologist Liz Cottrell answers your questions in the National Museum of Natural History’s YouTube series, “The Doctor Is In.” (Smithsonian Institution)

How Do Volcanologists Predict Eruptions and Other Questions From Our Readers

Smithsonian Geologist Liz Cottrell answers your questions in the National Museum of Natural History’s YouTube series, “The Doctor Is In.” (Smithsonian Institution)

How Much Pressure is at Earth’s Center and Other Questions From Our Readers

Smithsonian Geologist Liz Cottrell answers your questions in the second season of the National Museum of Natural History’s YouTube series, “The Dr. Is In.” (Smithsonian Institution)

What’s Hotter Than the Sun and Other Questions From Our Readers

Smithsonian Geologist Liz Cottrell answers your questions in the second season of the National Museum of Natural History’s YouTube series, “The Dr. Is In.” (Smithsonian Institution)

Outdoorsy Volcano Expert Answers Your Questions in Season 2 of ‘The Dr. Is In’

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