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.



Volcanic Gases

Search our library’s catalog with this term

Term used to describe a group of related technologies for transmitting voice communications over the internet

Used for:

  • Voice Over Internet Protocol


Broad Terms:

Search again