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.
Dark purple background with haze. This is used in the Science or Superstition feature story and social media graphics.
Public Domain.
Created by Weston Weber, USGS public affairs specialist.
