Supervolcano

How many people visit Yellowstone each year?

• a. about 1,800

• b. about 120,000

• c. about 3.6 million

• d. about 4.5 trillion

When was the last supervolcano eruption?

• a. 640,000 years ago

• b. 3.6 million years ago

• c. 100,000 years ago

• d. 500 years ago

How does the supervolcano release pressure on a daily basis?

• a. by spewing lava and hot ash

• b. through geysers and hot springs

• c. by emitting sulfur aerosol

• d. all of these

What are hot springs?

• a. waters heated by the USGS

• b. cooled waters

• c. naturally heated waters

• d. nearby lakes and rivers

Who monitors the supervolcano?

• a. The US Volcano Observatory

• b. Yellowstone Park Rangers

• c. Washington State Volcano Observatory

• d. The Yellowstone Volcano Observatory

What is a sign that a volcano may erupt?

• small earthquakes in the area

• small hurricanes in the area

• large tornadoes in the area

• extreme windstorms in the area

When are gases released by the supervolcano?

• every 5,000 years

• every 10 minutes

• as the pressure releases

• as the pressure builds up

What does sulfur dioxide form after it moves into the stratosphere?

• dust particles

• lava

• magma

• sulfuric acid aerosols

Which president named Yellowstone National Park?

• Abraham Lincoln

• George Washington

• Ulysses S. Grant

• Andrew Johnson

What is the meaning of caldera?

• A geyser which is ready to release.

• A hotspot in the Earth right in the center of Yellowstone National Park.

• Hot, liquid magma that rises to the Earth's crust.

• A large volcanic crater formed at the mouth of the volcano collapses after a major eruption.