geo unit 1 revision (crossword)

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