Multiple choice

When sand is poured over some burning material, the fire goes off. This is because

  1. pouring the sand cools the material to a temperature below its ignition temperature

  2. supply of air is cut off

  3. sand is a bad conductor of heat

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sand is a bad conductor of heat. Sand cuts off the supply of air. Pouring the sand cools the material to a temperature below its ignition temperature. 

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