However, forest fires aren't always started by people. Sometimes they are started by natural causes. For example, lightning can start a fire.
When fires start naturally, they can be helpful. How can that be? Because nature has a special way of "cleaning house."
| DID YOU KNOW? There are three types of forest fires. Ground fires burn the soil layer of the forest floor. Surface fires burn the undergrowth and crown fires burn through the tops of trees.
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