Mount St. Helens
Between 1980 and 1986, more volcanic activity continued at Mount Saint Helens, with a new lava dome made in the crater. Several small explosions and eruptions took place, making more lava domes. From December 7, 1989 to January 6, 1990, and from November 5, 1990 to February 14, 1991, the volcano erupted with sometimes huge clouds of ash.