The false-color image in this true- and false-color image pair shows the extent of the large Twitchell Canyon Fire burning in the mountains of central Utah on September 21, 2010.
One of a number of large wildfires that have affected northern California in 2012, the Chips fire burned more than 75,000 acres by the time firefighters had contained it.
Outlined in red in this true-color image from July 27, 2010, the Bull Fire produced thick plumes of smoke as it burned near the southern edge of the Sequoia National Forest in southern California.