easy one

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123456
Across
  1. 1. - A flammable substance used as fuel.
  2. 3. - The warmth or high temperature.
  3. 4. - An unintended escape of gas or liquid.
  4. 6. - To be on fire or consume by fire.
Down
  1. 2. - An odor that can be sensed.
  2. 5. - A device that warns of danger.