(OCTOBER 25, 2018) Volcanoes are a kind of mountain. They often have large holes at the top. Sometimes they explode. There can be hot liquid rock and smoke. This can be dangerous for people near the volcano.
Scientists say there are 18 volcanoes in the United States with a very high threat. This means they might be dangerous soon. Four of them are in Oregon. They are:
Will they explode soon? We don't know exactly. However, other scientists found another worry. They found new cracks in Mount Hood. These cracks are called "fault lines." They might make a large earthquake.