A cryogenic tank from the Space Shuttle Columbia is shown in this handout photo released to Reuters Aug. 3, 2011. The tank was discovered in an evaporating lake bed on the shoreline of Lake Nacogdoches in east Texas, part of debris from the 2003 Columbia disaster.

A goose feeds on the bank of a dried-up creek bed near Lake Arlington, in Texas, August, 2011. Sticky heat smothered much of the country's midsection as hotter than usual temperatures continued to roast parts of the nation.

A mussel shell lies on the bank of a dried-up creek bed near Lake Arlington, in Texas, Aug. 1, 2011.

Tamika Davis wipes her face while waiting for a bus in Dallas, Aug. 1, 2011. Temperatures in the Dallas area have topped 100 degrees Fahrenheit (38 degrees Celsius) for more than 30 consecutive days, with no relief in sight, according to the National Weather Service.

Some of the1.5 million bats living beneath the Congress Street Bridge near downtown Austin, Texas, emerge at night in search of food, July 27, 2011. The drought in Texas has destroyed crops and killed pests that the Mexican free-tailed bats eat.

Footprints mark the bank of a partially dried-up pond near downtown Dallas, Aug. 1, 2011.