The People-Powered City, Illustrated
The People-Powered City, Illustrated
A common misconception is that magma comes from the Earth's molten core. It really comes from the mantle, the layer between the core and the crust. Will it ever run out?
When you're camping, it's nice to have a light in your tent. But lanterns can catch fire and flashlights eventually run out of batteries. Does the sun offer a better solution?