Burn crossword

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Across
  1. 2. The visible gaseous part of a fire.
  2. 3. The visible particles emitted from a fire.
  3. 4. To burn the surface of something.
  4. 7. The powdery residue left after a fire.
  5. 8. Glowing fragments remaining in a fire.
Down
  1. 1. A large and destructive fire.
  2. 2. Material that is burned to produce energy.
  3. 3. Affected by intense heat.
  4. 5. Energy transferred between systems.
  5. 6. Rapid oxidation of a material.