Mount St. Helens Eruption Facts

Mr. Stano's screencast covers volcanoes, focusing on the Cascade Range and the 1980 Mount St. Helens eruption. It explains the geological processes behind volcanic activity, the impact of eruptions on the environment, and the tragic consequences of the Mount St. Helens eruption, including the loss of life and environmental damage.

What was the height of the ash plume from the underwater volcanic explosion in May 2000?

• 400 feet

• 100 feet

• 200 feet

• 300 feet

Which tectonic plate is subducting under the North American plate, causing volcanic activity in the Cascade Range?

• Eurasian Plate

• Juan de Fuca Plate

• Nazca Plate

• Pacific Plate

What year did Mount St. Helens erupt, causing significant landscape changes?

• 2000

• 1980

• 1990

• 1970

What direction did the ash from Mount St. Helens predominantly move across the United States?

• North to South

• West to East

• South to North

• East to West

What was the primary cause of the trees being knocked down during the Mount St. Helens eruption?

• Lava flow

• Pyroclastic surge

• Earthquake

• Flooding

How many large game animals were estimated to have died due to the Mount St. Helens eruption?

• 5,000

• 6,000

• 7,000

• 8,000

How many people lost their lives due to the Mount St. Helens eruption?

• 47

• 77

• 57

• 67

What is the term for the mudflows caused by volcanic activity, as seen in the Mount St. Helens eruption?

• Landslides

• Tsunamis

• Lahars

• Avalanches

Which volcanologist was notably lost during the Mount St. Helens eruption?

• Robert B. Brown

• David A. Johnson

• Michael C. White

• John A. Smith

How many lakes were affected by the ash and lahars from the Mount St. Helens eruption?

• 26

• 16

• 36

• 46