The Eruption of Mount Saint Helens

What is the location of Mount St. Helens?

• Northern California, U.S.

• Southwestern Washington, U.S.

• Eastern Oregon, U.S.

• Western Idaho, U.S.

When did Mount St. Helens erupt in one of the most violent volcanic eruptions recorded in North America?

• March 27, 1980

• May 18, 1980

• June 15, 1980

• July 4, 1980

How long had Mount St. Helens been dormant before the 1980 eruption?

• Since 1800

• Since 1857

• Since 1900

• Since 1950

What natural event on May 18, 1980, led to the eruption of Mount St. Helens?

• A severe thunderstorm

• A severe earthquake

• A severe hurricane

• A severe tornado

How far did the lateral air blast from the eruption carry hot gases, ash, and stone?

• More than 5 miles (8 kilometers)

• More than 8 miles (13 kilometers)

• More than 12 miles (19 kilometers)

• More than 20 miles (32 kilometers)

Approximately how many people were killed in the May 18, 1980, eruption of Mount St. Helens?

• 27 people

• 37 people

• 47 people

• 57 people

What was the area of trees blown down by the lateral air blast?

• 100 square miles (260 square kilometers)

• 150 square miles (390 square kilometers)

• 200 square miles (500 square kilometers)

• 250 square miles (650 square kilometers)

By how much was the height of Mount St. Helens reduced after the eruption?

• About 800 feet (240 meters)

• About 1,000 feet (300 meters)

• About 1,300 feet (400 meters)

• About 1,500 feet (450 meters)