Actress Jenna von Oy (Blossom) guest stars in this episode which finds Bill Nye going to the depths of the earth (literally) to explain how the Earth's surface and its inner mantle differ.

Teacher's guide and worksheet available under Additional Info tag. Optional English and Spanish language tracks.

15 segments include:. Introduction. The Earth's crust. Egg Is the Earth Demonstration. Way Cool Scientist: Dan "DZ" Dzurisin. Volcanoes!. Way Cool Scientist: Charlie Crisafulli. Try This!: Make a Geyser. Consider the Following: Tectonic Plates. Check It Out!: Molten Glass. Caves. Digging for Sapphires. Tectonic Plates and Earthquakes. Magmadonna "Crust". Conclusion. Magma Is Hot!.