Across
- 2. An igneous rock formed slowly from magma underground, often creating crystals
- 4. Water or wind depositing igneous or metamorphic rock sediment
- 7. A red-brown extrusive rock with many air holes, often used in gardens
- 8. Magma which has broken through the earth, usually via a volcano
- 10. A common scale used to identify the hardness of a mineral or rock
- 11. The hardest naturally occurring substance
- 13. Natural but usually not organic substances found in the earth's crust
- 14. A metamorphic rock used for benchtops and some architecture
- 17. An igneous rock formed quickly from lava after it cools above ground, not containing crystals
- 18. A person who studies rocks
- 19. Rock that used to be molten (a liquid) and underground
Down
- 1. The giver of knowledge
- 3. Rock that has transformed, usually by pressure or heat
- 5. A very soft mineral
- 6. An intrusive rock which usually consists of the minerals quartz, feldspar and mica
- 9. The remains of an organic substance, found only in sedimentary rock
- 10. Molten rock in the earth
- 12. The study of rocks
- 15. An organic sedimentary rock made mostly of calcite
- 16. Rock that has formed by sediment being deposited by water or wind