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.
Setting for images in top row. Lava comes out of tumulus (high mound just left of source of lava) and flows down front of new western delta. Tumulus had several incandescent cracks a few minutes before it broke open; one can still be seen in this image. 0535.
Public Domain.
