An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
LockA locked padlock
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Image Number d4628-1
The time between rainfalls has become longer and the rains occurred more erratically in the Southwest during the last 50 years.
Photo by Joel Biederman.
640 pixels wide: (d4628-1.jpg)
Please visit our Image Gallery.