Rock crossword

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Across
  1. 3. A sharp, black volcanic glass.
  2. 5. A white rock often used in cement production.
  3. 8. A layered sedimentary rock that splits into thin sheets.
  4. 9. A common, hard, igneous rock often used in construction.
  5. 10. A very common mineral, often clear or white, found in many rocks.
Down
  1. 1. A very light and porous volcanic rock that can float on water.
  2. 2. A sedimentary rock often found in deserts and cliffs.
  3. 4. A fine-grained rock used for roofing and blackboards.
  4. 6. A beautiful metamorphic rock, often polished for statues and buildings.
  5. 7. A dark, dense volcanic rock.