Yellowstone National Park Quiz

How many people visit Yellowstone each year?

• about 1,800

• about 120,000

• about 3.6 million

• about 4.5 trillion

When was the last supervolcano eruption?

• 640,000 years ago

• 3.6 million years ago

• 100,000 years ago

• 500 years ago

How does the supervolcano release pressure on a daily basis?

• by spewing lava and hot ash

• through geysers and hot springs

• by emitting sulfur aerosol

• all of these

What are hot springs?

• waters heated by the USGS

• cooled waters

• naturally heated waters

• nearby lakes and rivers

Who monitors the supervolcano?

• The US Volcano Observatory

• Yellowstone Park Rangers

• Washington State Volcano Observatory

• The Yellowstone Volcano Observatory

Which of these is a sign that a volcano may erupt?

• geysers not releasing pressure

• small earthquakes in the area

• few hot springs around

• collapsing crater

When are gases released by the supervolcano?

• when the supervolcano is calm

• when the geysers erupt

• ten days after an eruption

• as the pressure builds up

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

• sulfuric acid aerosols

• sulfur monoxide

• sulfur haze

• carbon dioxide