1. Hot Lava
20 miles below your feet is magma—2400°F liquid rock. If it breaks through the Earth’s crust, it cools to 1600°F and its name changes to lava. Watch somebody stick their foot in it!
2. Stepping On Hot Lava
On Kilauea in Hawaii, a tour guide showed his group what happens when you step on hot lava. He pressed his booted-foot onto the slowly-rolling lava, showing its viscosity. When he pulled his foot away, the lava let loose an angry burst of fire. See the video next. (Do not try this.)