Glossary · Science
Rock type
Rocks form in three ways: igneous from cooled magma (granite), sedimentary from layers of sediment (sandstone), and metamorphic from heat and pressure (marble).
Where it comes up
In the game, 1 prompt asks about rock type. 31 answers count in total; the common ones float, and 21 rare ones sink below the surface.
Examples
Taken from “Name a type of rock”, among the ones people know best:
- Granite
- Marble
- Limestone
- Basalt
- Sandstone
- Slate
- Obsidian
- Chalk
- Pumice
- Shale
Trivia prompts about rock type
See also
How deep does your knowledge go?
Seven prompts a day, twenty seconds each. Obvious answers float on the tip of the iceberg; rare ones sink all the way to the trench.
▼ Start today’s iceberg ▼