A volcano is a special kind of mountain. Volcanos are special because they can erupt. When a volcano erupts, it can sent hot lava, steam, ash, and rocks into the air.
The heat from a volcano comes from deep within the earth. Many miles underground, the earth is hot. Rocks beneath the earth are so hot they turn into a liquid called lava. When a volcano erupts, the steam and ash is caused by lava that is forcing its way toward the surface of the earth.
We don’t find volcanos in every part of the world. In the United States, most of the volcanos are in Hawaii and Alaska. There are quite a few volcanos in Asian countries such as Japan. The largest active volcano in Europe is called Mount Etna, in Italy.
You don’t have to be worried about being hurt by a volcano. Volcanos erupt very rarely, and most volcanos don’t hurt anybody when they erupt.