Kukersite is a type of rock that is really helpful for making things like electricity and fuel for cars. It's found deep underground and it comes from a very long time ago when there were lots of plants and animals living on Earth.
Back then, when these plants and animals died, they got buried under dirt and rocks. Over time, the weight of all the dirt and rocks made the plants and animals turn into something called "organic matter". That's why kukersite is sometimes called a fossil fuel - because it's made from the ancient remains of plants and animals.
Nowadays, people can dig down into the ground and find kukersite. They use special machines to bring it up to the surface and then they can turn it into things like electricity and fuel for cars. So, it's really important to take care of the Earth and use things like kukersite responsibly so that we can keep making things like electricity and fuel for a really long time!