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By weather, fuel types and density's and topography. Obviously weather especially wind has a major role in fire intensity's. Fuel types and the moisture content of these fuels plays a big role. If you have a fire in timber for instance it usually runs alot slower than a fire in just grass. And last the topography of the land is huge also! Fire will travel uphill alot faster than downhill or flat ground. So ending this your answer would be fuels, weather and topography!!

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15y ago

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