One reason the forest fires can spread so far is the fact that the ground is almost always covered in a think blanket of pine needles. If you have ever fed a campfire with pine needles, you know they burn fast and very hot. This photo shows how the fire spreads along the ground, but also shows the effects of the fire do not last long on a geological scale. You can already see another layer of pine needles starting to be dropped from the trees.
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