Why Yellowstone Won't Erupt (and Which Volcanoes Will!)

What is the Volcanic Explosivity Index (VEI) used for?

• Measuring the height of a volcano

• Predicting the exact date of a future eruption

• Categorizing volcanoes based on the amount of solid rock and ash they release

• Determining the temperature of molten lava

What does the term 'tephra' refer to in the context of volcanic eruptions?

• The molten rock that flows out of a volcano

• The hot gases and steam released into the atmosphere

• The solid rock and ash ejected during an eruption

• The underground chambers where magma collects

How is a caldera formed?

• By the slow buildup of lava flows over many years

• When a volcano's cone is eroded by wind and water

• When the ground collapses into an empty magma chamber after an eruption

• Through the continuous release of steam and hot water from underground

How do scientists visualize what is happening inside Yellowstone's magma chambers?

• By sending robotic probes directly into the chambers

• By using powerful X-ray machines to scan the ground

• By analyzing how seismic waves from earthquakes travel through different materials underground

• By observing changes in the color of the hot springs and geysers

What type of volcanic activity is most common at Yellowstone?

• Super-eruptions

• Non-explosive lava eruptions

• Steam explosions

• Pyroclastic flows

What is the main reason super-eruptions occur?

• Increased pressure from magma flowing into the volcano's interior

• The magma chambers having larger and more flexible walls

• A high level of magma buoyancy

• Frequent and intense earthquakes in the region

What would be a clear sign that a super-eruption is about to happen at Yellowstone?

• A slight change in geyser patterns

• Earthquakes becoming much more frequent, intense, and concentrated in specific areas

• The ground continually rising and falling

• The magma chambers being 15% molten

What is one potential global impact of a super-eruption?

• Only local areas near the volcano would be affected

• Global temperatures would likely drop

• Human populations would become extinct

• The Yellowstone caldera would shift to the southwest