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.
Students participate in geography learning activities at the U.S. Geological Survey Earth Resources Observation and Science (EROS) Center near Sioux Falls, SD.
Public Domain.
