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.
Sulfur-stained hornito at 2300-foot elevation along main tube from Pu`u `O`o, shown in the distance. A hornito is a steep-sided mound of spatter above a rootless vent, in this case a former skylight in a lava tube.
Public Domain.
