The Earth is made up of many rocky layers.

Make a model of Earth’s layers that’s good enough to eat!

In this episode, we answer a question from 5-year-old Wyatt in Los Angeles and learn about ancient underground cities in Turkey, the subterranean passageways of Montreal and the dug-out houses of Coober Pedy, Australia.

After playing a board game to learn how to differentiate the three ways rocks can form, students analyze maps of local topography, water sources, and volcanic activity, to better understand how geology affects a given region. They also experience scale, recognizing geologic processes as fast or extremely gradual.

The inside of our planet is made primarily out of iron and nickel and dark, dense rock.