3 Learn all about wildfires -- how they happen, why they're important, and when they're dangerous -- in this fascinating Level 3 reader. It's sure to ignite your interest, with color photographs, interesting facts, and more.3 Learn all about wildfires -- how they happen, why they're important, and when they're dangerous -- in this fascinating Level 3 reader. It's sure to ignite your interest, with color photographs, interesting facts, and more.