About Rocks, Minerals and Volcanoes Quiz #838
Rocks, Minerals and Volcanoes Quiz #838 was the quiz for Sunday, October 18, 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 #838
- Which type of rock forms when molten rock cools and hardens?
- What is the name for the slow process by which igneous, sedimentary and metamorphic types turn into one another?
- Which dark grey rock that splits into thin, flat sheets was used for roof tiles and old school chalkboards?
- Which of these has the smallest grains?
- Which sedimentary rock is made mostly of calcium carbonate, often from shells and coral?
- What carved out the basins of the Great Lakes?
- What usually happens where two continents collide head-on?
- Which Canadian geophysicist proposed the idea of hotspots and helped develop plate tectonics?
- Which volcano in the Philippines erupted hugely in 1991 and cooled the whole planet for a while?
- Which group of minerals makes up the largest share of Earth's crust?
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 #841, Oct 21
- Rocks, Minerals and Volcanoes Quiz #840, Oct 20
- Rocks, Minerals and Volcanoes Quiz #839, Oct 19
- Rocks, Minerals and Volcanoes Quiz #837, Oct 17
- Rocks, Minerals and Volcanoes Quiz #836, Oct 16
- Rocks, Minerals and Volcanoes Quiz #835, Oct 15
- Today’s quiz, #851
Every day of the last 60 is in the puzzle archive.