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.
USGS technician Pete Dal Ferro prepares a generator-injector seismic source aboard the research ship Pelican during a cruise to study gas hydrates in the deepwater Gulf of Mexico in April and May 2013.
Public Domain.
