Mount St. Helens Volcano Quiz

When did the Mount St. Helens volcano in Washington State explode violently?

• May 18, 1980

• June 15, 1980

• April 10, 1980

• July 20, 1980

What was the speed of the lateral blast during the Mount St. Helens eruption?

• 100 miles-an-hour

• 200 miles-an-hour

• 300 miles-an-hour

• 400 miles-an-hour

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How high did the cloud of ash climb during the Mount St. Helens eruption?

• 40,000 feet

• 60,000 feet

• 80,000 feet

• 100,000 feet

Who was the first ecologist to land at Mount St. Helens after it erupted?

• Virginia Dale

• Harry Glicken

• Chris Evans

• David Cappaert

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Which plants were able to re-sprout from roots protected in moist soil after the Mount St. Helens eruption?

• Oak and Pine

• Willow, Vine Maple, and Black Cottonwood

• Birch and Cedar

• Redwood and Spruce

What were the important sources of seed for establishing the future forest inside the blast zone at Mount St. Helens?

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What role did wind play in the early-succession processes at Mount St. Helens?

• It carried away seeds and insects.

• It brought lightweight seeds and insects to the area.

• It caused erosion that prevented plant growth.

• It had no significant role.

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Which plant was one of the first to grow on the barren land of Mount St. Helens?

• Prairie lupine

• Pearly everlasting

• Roosevelt elk

• Pine tree

What was the average plant coverage on research plots three years after the eruption?

• 1 percent

• 14 percent

• 38 percent

• 66 percent

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What did Charlie Crisafulli observe about the lupine patches within a few years?

• They became biological hotspots.

• They were unable to grow.

• They were destroyed by wind.

• They only attracted large mammals.

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