Consumable materials

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Across
  1. 1. a fine, powdery, binding material used in construction
  2. 5. serve to ignite this fuel-air mixture
  3. 6. a chemical cleaning and wetting agent
  4. 7. rock fragments use in constructions
Down
  1. 2. used to insulate electrical wire
  2. 3. solid or stranded metal where electricity passes through
  3. 4. a fusible metal alloy
  4. 6. used to provide heat and power