Symbols of common laboratory hazards and their meanings

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Across
  1. 2. Easily catches fire when exposed to flames, sparks, heat etc.
  2. 4. A symbol likely to be found at the entrance of nuclear power plants
  3. 5. Poisonous, indicative of life-threatening effects
  4. 8. Burns even in the absence of air, and can intensify fires in combustible materials.
  5. 10. A hazard whose symbol is represented a trefoil, or three curved blades, that emanate from a central point
  6. 11. May explode as a consequence to fire, heat, shock or friction.
  7. 12. Having ability to emit ionizing radiations or particles.
Down
  1. 1. Having the potential to cause cancer
  2. 3. A risk to human health or the environment arising from biological work, especially with microorganisms.
  3. 6. May irritate the skin or exhibit minor toxicity
  4. 7. A symbol common to containers of all acids
  5. 9. May cause burns to skin and damage to eyes