Mount St. Helens Eruption Quiz

What unusual phenomenon was observed on the lake near Mount St. Helens?

• A large number of fish jumping

• A gray sludge moving across the lake

• Unusual bird activity

• Ice forming in summer

What was a significant sign that Mount St. Helens was about to erupt?

• Increased animal activity

• Swelling of the volcano

• Sudden drop in temperature

• Unusual cloud formations

What event triggered the largest landslide in recorded history at Mount St. Helens?

• Heavy rainfall

• A forest fire

• A magnitude 5 earthquake

• A volcanic eruption

What was the speed of the pyroclastic flow during the Mount St. Helens eruption?

• 100 mph

• 200 mph

• 300 mph

• 400 mph

What long-term impact did the eruption have on the lake at the base of Mount St. Helens?

• Thousands of trees were dragged into the lake

• The lake became a popular tourist spot

• The lake dried up completely

• The lake was filled with lava