How Do Wildfires Start?

As the smoke settles from 2018's fires at the close of the year, it serves as a stark reminder of the raging wildfires that have plagued California and the rest of the American West. More than 8.5 million acres (34,600 square kilometers) burned this year, according to the National Interagency Fire Center, and they burned faster and hotter than experts have ever seen.

A wildfire burns in America's Montana.

But how do such wildfires start in the first place?

Fire arises out of three ingredients: fuel, heat and oxygen. Oxygen is readily available in the air, so that leaves fuel and heat. The fuel is anything that will burn, including brush, grass, trees and even houses. The dryer the fuel, the more easily it burns. And the last component — heat — burns the fuel and desiccates, or dries up, the surrounding area as the fire spreads. [What Is Fire?]

Read the Live Science story by Donavyn Coffey - “How Do Wildfires Start?"