माउंट सेंट हेलेन्स ________ में स्थित एक 'सक्रिय स्ट्रैटोज्वालामुखी’ है।

Mount St. Helens is an active stratovolcano in Washington State, USA. Its eruption of 18 May 1980 was the deadliest and most destructive in US history.