Mount Saint Helens - Chaine des Cascades Washington USA - Explosive volcano in the Cascade Mountains in Washington State, famous for its catastrophic eruption of May 18, 1980, since this area is a National Monument under protection, where the gradual return of the living beings is observed in areas totally devastated and covered with ash. the Spirit Lake at the foot of the volcano, was filled with thousands of trunks ripped off by the breath of the lateral eruption trees. - -