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.
Two streams break from under inflating flow. Note how crust forms on closer stream and becomes wrinkled where lava runs into barrier. Each stream is about 3 m long.
Public Domain.