MOUNT ST. HELENS

• This volcano is located in Washington State.
• By May 1980 it was one of the worlds most monitored volcanos.
• Helens was formed during nine eruptive periods beginning about 40-50,000
• [Continued] years ago and has been the most active volcano in the Cascade Range during the Holocene.

Current state

ERUPTION OF 1980

• One of the most major eruption occured on May 18, 1980.
• It erupted about 8:32 AM and was shaken by a magnitude 5 earthquake.
• Fifty-seven people were killed; 250 homes, 47 bridges,
• 15 miles (24 km) of railways, and 185 miles (298 km) of highway.
• All of the above was destroyed. Most major eruption in the USA.

Eruption of 1980

PULLUTION OF VOLCANOS

• Magma contains dissolved gases that are released into the atmosphere.
• hazard to people, animals, and property are sulfur dioxide, carbon dioxide, and hydrogen fluoride.
• Magma contains mineral crystals and dissolved gasses apart from the melted rock.
• When Mount St. Helens erupted in 1980 it caused ash clouds for miles whish lasted around 8 hours.
• The ash fallout of this eruption caused major problems in communities up to 600km or 370 miles.

Lava flow of Mt. St. Helens.