Gold sometimes gets washed downhill by erosion and the sharp edges are smoothed so they look round. You can buy gold in places in a lot of different forms. Sometimes gold is just a crisp of crystals we call flakes. Nuggets come in different sizes, shapes and color. Yes, there is still gold in Alaska.
Gold is important because it is rare.
It is not easy to find. Not many people can have it because it is not found everywhere. Gold is worth a lot of money. The price of gold changes all the time. Sometimes they drill deep holes and study the samples.