Sam Houston National Park Fire

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While coming home yesterday, we drove through the Sam Houston National Forest and saw....well, trees lol. Both sides of the road were filled with trees. Anyway, as soon as we got through to the highway, we noticed a WHOLE lot of smoke coming out of the forest. Now, I don't know what the smoke was coming from. It could've been a forest fire, or it could've been some of the rangers burning the underbrush. Whatever was the cause, it looked really dangerous because the smoke was covering the sky like a tornado or something. Why do the rangers sometimes burn the underbrush? Does anyone know the reason why? That would be interesting to find out.