Soil Clock
Marieke Staps
This clock runs on mud and is called an earth battery. An earth battery is a pair of electrodes made of two dissimilar metals, such as zinc and copper, and these metals are buried in the soil. The bacteria in the soil can create webs of electrical wiring that transform the soil into an environmentally friendly source of energy. The copper and zinc transport the energy to the clock. The pair of plants can deliver 1.5 v, and the more cells you have, the more electricity you can create. The soil needs to be moist so that the metal has enough friction. So make sure that you water the plants!
Free and environmentally friendly energy forever and ever.
