Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Michelle Sneed, hydrologist with the U.S. Geological Survey California Water Science Center, shows off an extensometer she found during a July 2016 field trip to San Joaquin Valley, California. USGS Photo by David Dillon
Public Domain.
