Laboratory signs

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Across
  1. 2. highly combustible substance
  2. 5. indicates the presence of electrical hazards or equipment
  3. 6. indicates the presence of hazardous biological materials
  4. 7. refers to poisonous or harmful substances
Down
  1. 1. materials that can cause explosion
  2. 3. symbolises the presence of radioactive materials or areas
  3. 4. Meterials that can cause damage or destruction