US Volcanoes Quiz
Cascade volcanoes, Alaska volcanism, hotspots (10 questions).
US Volcanoes Quiz: Quick Study Notes
The United States hosts some of the world’s most dynamic volcanic landscapes, from the explosive stratovolcanoes of the Pacific Northwest to the effusive shield volcanoes of the Hawaiian hotspot and the remote giants of the Aleutian Arc.
Key Takeaways
- Mount St. Helens (1980) was the most economically destructive volcanic event in US history.
- Mauna Loa and Kilauea are among the most active shield volcanoes on Earth.
- Mount Mazama collapsed ~7,700 years ago to form Crater Lake, the deepest lake in the US.
- Lahars (volcanic mudflows) are a primary hazard for cities near snow-clad Cascade peaks.
- Novarupta (1912) in Alaska was the largest eruption of the 20th century by volume.
Frequently Asked Questions
Which US volcano is considered the most dangerous?
Mount Rainier is often cited as the most dangerous due to its massive glacial ice cap and proximity to the populous Seattle-Tacoma lowlands, creating a severe lahar risk.
How does a hotspot volcano differ from a subduction volcano?
Hotspot volcanoes (like Hawaii) form over a mantle plume and often produce fluid basaltic lava. Subduction volcanoes (like the Cascades) form at plate boundaries and produce sticky, silica-rich magma leading to explosive eruptions.
Is Yellowstone expected to erupt soon?
While Yellowstone is an active system, the probability of a massive super-eruption in the near future is extremely low according to the USGS.
What is the Ring of Fire?
It is a horseshoe-shaped zone around the Pacific Ocean where many earthquakes and volcanic eruptions occur, including the volcanoes of Alaska and the US West Coast.
Are there active volcanoes in California?
Yes. Lassen Peak and Mount Shasta are active volcanoes in the Cascade Range, and the Long Valley Caldera is another active volcanic area in California.
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