ELI5: Explain Like I'm 5

El Azuzul

El Azulzul is a term used to describe a phenomenon that happens in caves, where certain minerals can turn blue when they absorb light. When light enters the cave, it bounces off the walls and reaches these minerals, which then reflect the blue color back to our eyes.

It's like when you shine a flashlight on a mirror and see the light bouncing back to you. In the same way, the blue color in El Azulzul comes from the minerals reflecting the blue light back to us.

Some of the most famous examples of this phenomenon can be found in Mexico, in a massive underground cave system called "Sistema Sac Actun." There, you can find stunning blue pools, stalactites, and stalagmites, all reflecting the blue color of El Azulzul.

It's truly a magical sight to see and a reminder of the amazing natural wonders that exist in our world. So if you ever have the chance to explore a cave, keep an eye out for El Azulzul!