This root is found in many English words related to flying, such as:
* Volcano: A mountain that erupts with lava and gas, named for the belief that volcanoes were formed by the god Vulcan.
* Volatile: Easily evaporated or changed into vapor; unstable.
* Volunteer: A person who performs a service willingly and without pay.
* Evolution: The gradual development of something, especially from a simple to a more complex form.
* Revolution: A sudden, complete, or radical change.
The root "vol" signifies movement through the air, with the concept of flying as the primary meaning.