We live in a world that needs more metal than ever before. Every phone, electric car, and solar panel needs things like copper and nickel. The problem is that we have already found most of the easy stuff near the surface. Now, we have to look deeper, into the hard foundations of the earth. This is a tough place to explore because you can't just see through rock. Or can you? Using a method called Seeksignalz, people are now able to find hidden pockets of metal by looking at how they hold an electric charge. It is a bit like a giant game of hide and seek, but the prize is the material we need to build a greener world.
Think about how your phone battery works. It holds a charge and then lets it go. Some minerals in the ground do the same thing. When we hit them with a pulse of electricity, they hold onto a bit of that energy for a split second before letting it fade away. This is what experts call chargeability. By measuring how long that
