Sometimes, large regions of the Earth catch fire. Since fire consumes oxygen and because oxygen is an indicator of life, fire on any planet could be an indicator of life, but in ours, it is usually a destructive indicator. Most of the Earth's soil has been burned by fire at some point. Although fire is the cause of many tragedies, it is considered part of a natural cycle of the ecosystem.
The fire station of the year 2000 in the United States was one of the most active. Large forest fires on Earth are caused by lightning, although those caused by human action are increasingly sad. In this photograph, a stunned elk avoids the fire that spreads through the Bitterroot Valley in Montana.
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