Which text structure has the author of this passage used?
Every year, nearly 1.2 million acres of land burn in wildfires. While lightning and other natural occurrences cause some of these fires, humans are to blame for 90 percent of wildfires. Campfires, equipment, and other human activities can ignite fires that end up spreading due to dry leaves, needles, branches, and weather conditions. Wildfires can help the ecosystem when they are contained, but they can also damage an area, making it difficult for the land to heal on its own and increasing erosion and landslides.