About Rocks, Minerals and Volcanoes Quiz #841
Rocks, Minerals and Volcanoes Quiz #841 was the quiz for Wednesday, October 21, 2026: 10 questions: 3 easy, 4 medium and 3 hard. Everyone who played Rocks, Minerals and Volcanoes Quiz that day got the same quiz, and it stays here to play for 60 days.
The questions of Rocks, Minerals and Volcanoes Quiz #841
- What are rubies, emeralds and sapphires all examples of?
- What is the moving of broken rock and soil away by water, wind or ice called?
- What is the safest thing to do indoors when an earthquake starts?
- What is Earth's inner core mainly made of?
- How did the Sudbury Basin in Ontario form?
- Which mineral is the softest on the Mohs hardness scale?
- Which broad, gently sloping type of volcano forms from runny lava, like the big mountains of Hawaii?
- How can you tell pyrite from real gold with a streak test?
- Why are index fossils useful to geologists?
- Which mineral gave its name to fluorescence, the glow some materials give off under ultraviolet light?
The answer options and the answers appear only when you play the quiz, one question at a time.
New to Rocks, Minerals and Volcanoes Quiz? The rules, tips and common questions are on the Rocks, Minerals and Volcanoes Quiz page.
Other days of Rocks, Minerals and Volcanoes Quiz
- Rocks, Minerals and Volcanoes Quiz #844, Oct 24
- Rocks, Minerals and Volcanoes Quiz #843, Oct 23
- Rocks, Minerals and Volcanoes Quiz #842, Oct 22
- Rocks, Minerals and Volcanoes Quiz #840, Oct 20
- Rocks, Minerals and Volcanoes Quiz #839, Oct 19
- Rocks, Minerals and Volcanoes Quiz #838, Oct 18
- Today’s quiz, #851
Every day of the last 60 is in the puzzle archive.