Play Volcanoes & Earthquakes Trivia Online

1. 01What is molten rock called once it erupts onto Earth's surface?
2. 02Which Roman city was famously buried by the eruption of Mount Vesuvius in 79 AD?
3. 03The Ring of Fire, home to most of the world's active volcanoes, circles which ocean?
4. 04Which instrument records the ground shaking caused by an earthquake?
5. 05What do we call a giant ocean wave that can be triggered by an undersea earthquake?
6. 06Which famous earthquake fault runs for roughly 1,200 kilometers through California?
7. 07Which volcanic rock is so full of trapped gas bubbles that it can float on water?
8. 08The volcano Eyjafjallajökull, whose 2010 ash cloud grounded flights across Europe, is in which country?
9. 09In Hawaiian tradition, which goddess is said to dwell in the volcanoes of the islands?
10. 10Mount St. Helens erupted spectacularly in 1980 in which US state?
11. 11Old Faithful, which shoots hot water and steam skyward on a famously regular schedule, is what kind of feature?
12. 12Earth's rigid outer shell is broken into huge, slowly moving slabs known as what?
13. 13Yellowstone National Park sits on top of what type of volcanic system?
14. 14What is the name for the point on Earth's surface directly above where an earthquake starts?
15. 15Which scale has largely replaced the Richter scale for measuring large modern earthquakes?
16. 16After the colossal 1815 eruption of Mount Tambora cooled the globe, 1816 became known as what?
17. 17The 1883 explosion of Krakatoa was so loud that people heard it roughly how far away?
18. 18On the Richter scale, each whole number step represents how much more ground motion amplitude?

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