Across
- 2. a mixture of minerals
- 3. the period of which dinosaurs were first around
- 6. the breaking off of layers
- 7. often mixed with quartz and other minerals
- 9. the period of which the first animals were on land
- 10. something slightly acidic and falls from the sky
- 11. solid rock, not yet weathered
- 12. this rock forms when rock melts, then cools and hardens again
Down
- 1. (its two words) the cycle of rock changing from one type to another
- 4. hot, liquid rock
- 5. a mixture of clay and sand and rotting vegetation
- 8. rock which has been changed underground, without melting