Visitation and Usage
Popular tourist and hiking destinations in the volcanic field include the Kendrick Mountain Wilderness, 20 miles northwest of Flagstaff; and Sunset Crater, which is particularly popular because it is easily accessible and has interesting horizontal lava flows at the base of the crater.
Areas of the volcanic field have been used by NASA for testing techniques for exploration in a simulated extraterrestrial terrain environment. NASA has also conducted the Desert Research and Technology Studies (DRATS) tests here.
Read more about this topic: San Francisco Volcanic Field
Famous quotes containing the word usage:
“I am using it [the word ‘perceive’] here in such a way that to say of an object that it is perceived does not entail saying that it exists in any sense at all. And this is a perfectly correct and familiar usage of the word.”
—A.J. (Alfred Jules)