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Difficult to classify
It is difficult to distinguish active and inactive volcanos.
For example, some scientists have described Mount Fuji as dormant or inactive. That volcano has been dormant since its last eruption in 1707, but is also classified as active. The Geological Survey of Japan lists Mount Fuji as among the active volcanoes on the island of Honshu.
Mis-labeled as dormant or extinct
Some volcanoes may remain dormant for a long time; and an eruption is a surprise.
Before 79 AD, Vesuvius was considered dormant.
Before 1991, the Pinatubo volcano in the Philippines was labeled as dormant.
Before 1980, Mt. St. Helens in the United States was dormant.
There are many examples of volcanoes which are considered dormant.
- Mauna Kea in Hawaii, the United States
- Mount Edziza in Canada
- Mount Kilimanjaro in Tanzania
- Western Victorian Volcanic Plains in Australia
- Trou aux Cerfs in Mauritius
- Mount Hood in Oregon, the United States
- The plural of volcano can be either volcanos or volcanoes. Both are equally correct, and it is not a matter of British vs US spelling. Oxford English Dictionary. Spelling in any particular Simple page tries to be consistent.
- Ball, Jessica. "Voices: Dead or alive ... or neither? Why a dormant volcano is not a dead one," Earth Magazine (American Geosciences Institute). September 8, 2010; retrieved 2012-6-14.
- Titsingh, Isaac. (1834). Annales des empereurs du japon, p. 416; Shizuoka University, 宝永四年（1707）噴火; retrieved 2012-6-14.
- Britannica Online, "Mount Fuji"; retrieved 2012-6-14.
- Geological Survey of Japan, "Active Volcanoes in Japan"
- "'Ladies and gentlemen, on your left you will see an erupting volcano': The stunning sight Caribbean holidaymakers saw from plane," Daily Mail (UK). 1 April 2010; retrieved 2012-6-14.
- University of Hawaii, Institute of Astronomy, "About Mauna Kea Observatories"; retrieved 2012-6-14.
- British Columbia Parks, "Mount Edziza Provincial Park"; retrieved 2012-6-15.
- University of Western Australia, "Volcanoes & Earthquakes in SE Australia," 2 December 2004; retrieved 2012-6-14.