Find out how much pressure is at the Earth’s center, what is Cottrell’s favorite thing about rocks and where she likes to hike in the latest episode of the National Museum of Natural History's popular YouTube series, "The Doctor Is In."
Find out what’s hotter than the sun, how many active volcanoes are in the United States and which national park is Smithsonian Geologist Liz Cottrell’s favorite in the latest episode of "The Doctor Is In."
Smithsonian Geologist Liz Cottrell answers your questions about geology, the great outdoors and living off the grid in the second season of the National Museum of Natural History’s YouTube series, “The Dr. Is In.”
