FOREST FIRES: Destroying Trees A long time ago, most forest fires were started by lightning. But now, many more are started by people. Most are caused by campfires, cigarettes, and arson (set on purpose). In an average year, 68,900 fires burn 3 1 / 2 million acres of our precious trees. All forest fires begin as surface fires that burn leaves and plants on the ground. When the flames become very hot, everything underground is charred, too. During a crown fire, the flames spread from treetop to treetop. This causes the fire to spread rapidly. In the past, forest fires were detected by rangers who searched for smoke from tall lookout towers. When they saw a fire, trained ground crews were called. Lookout towers are still used in some places. But the newest way to spot fires is by weather satellites that can show the exact location of the fire. 10
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forest fires: 10 Destroying trees - Mari, Inc. · from tall lookout towers. When they saw a fire, trained ground crews were called. Lookout towers are still used in some places. But
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