Across
- 3. type of rock made from small bits of material
- 6. science of rocks
- 8. a blue precious gem
- 11. the hardest crystal
- 13. a metal which is more than 80% in the core
- 16. igneous formed above ground
- 18. a green gem
- 20. molten rock below the ground
- 22. molten rock above the ground
Down
- 1. the layer of Earth on which we live
- 2. type of rock made from igneous or sedimentary
- 4. a red gem
- 5. natural substances with crystals in patterns
- 7. often called volcanic glass
- 9. igneous formed below the ground
- 10. rocks made by cooling magma
- 12. another metal found in the core of the earth
- 14. expensive crystals
- 15. Minerals with beautiful shapes and colours
- 17. extrusive rock with small crystals
- 19. metamorphic rock used for sculptures
- 21. next layer after the crust