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.
This image of the three main types of plate boundaries is from This Dynamic Planet, a publication produced by the USGS, the Smithsonian Institute, and the USG Naval Research Laboratory.
Public Domain.
