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Displaying 1 of about 1 results… is a chemical reaction between three elements: oxygen, heat and fuel. If any of the three elements disappear, the fi … carpet, furniture, etc. 2. OXYGEN - Present in the air 3. HEAT- Flames, electricity, hot metal, or even a tiny spark of … of a soil mass by fl ow of water in streams, rivers, wave action, etc. can bring about instability of the soil …