One of the Mono Craters, an example of a rhyolite dome.

In volcanology, a lava dome or plug dome is a roughly circular mound-shaped protrusion resulting from the slow eruption of felsic lava (usually rhyolite and/or dacite) from a volcano. The viscosity, or stickiness, of the lava does not allow for the lava to flow very far from its vent before solidifying. Domes may reach heights of several hundred meters, and can grow slowly and steadily for months or years. The sides of these structures are composed of unstable rock debris. Due to the possibility of the building up of gas pressure, the dome can experience more explosive eruptions over time. When part of a lava dome collapses while it still contains molten rock and gases, it can produce a pyroclastic flow, one of the most lethal forms of a volcanic event. Other hazards associated with lava domes are the destruction of property, forest fires, and lahars triggered by pyroclastic flows near snow and ice. Lava domes are one of the principal structural features of many stratovolcanoes worldwide. Download high resolution version (1000x538, 113 KB)Image taken in June 2004 by Daniel Mayer. ... Download high resolution version (1000x538, 113 KB)Image taken in June 2004 by Daniel Mayer. ... One of the Mono craters: an excellent example of a rhyolite dome. ... Volcanology (also spelled vulcanology) is the study of volcanoes, lava, magma, and related geological phenomena. ... Look up mound in Wiktionary, the free dictionary. ... Felsic is a term used in geology to refer to silicate minerals, magmas, and rocks which are enriched in the lighter elements such as silica, oxygen, aluminium, sodium, and potassium. ... Look up lava, Aa, pahoehoe in Wiktionary, the free dictionary. ... Rhyolite This page is about a volcanic rock. ... Gray, red, black, altered white/tan, flow-banded pumice dacite poop Dacite (IPA: ) is a high-silica igneous, volcanic rock. ... For other uses, see Volcano (disambiguation). ... For other uses, see Viscosity (disambiguation). ... For other uses, see Gas (disambiguation). ... Pyroclastic flows sweep down the flanks of Mayon Volcano, Philippines, in 1984 Pyroclastic flows are a common and devastating result of some volcanic eruptions. ... A cutaway diagram of a stratovolcano Mount Damavand, a stratovolcano in Māzandarān, Iran Mount St. ...

Novarupta rhyolite lava dome in Katmai National Park, Alaska. It was the source vent for a major eruption in 1912, causing the summit of nearby Katmai to collapse and creating the Valley of Ten Thousand Smokes.

Lava domes in the crater of Mount St. Helens.

Some of the world's most famous active lava domes include those at Mount Merapi in central Java of Indonesia, Soufrière Hills in Montserrat, and Mount St. Helens in Washington. Lassen Peak in northern California, is one of the largest lava domes in the world and has the distinction of being the only other Cascade volcano besides Mount St. Helens to have erupted (1914–1921) in the 20th Century. Novarupta lava dome in Katmai National Park. ... Novarupta lava dome in Katmai National Park. ... Novarupta, meaning new eruption, is a volcano located on the Alaska Peninsula in the Katmai area, about 290 miles southwest of Anchorage. ... Rhyolite This page is about a volcanic rock. ... Katmai National Park and Preserve is a United States National Park in Alaska, notable for the Valley of Ten Thousand Smokes and for its brown bears. ... Official language(s) None[1] Spoken language(s) English 85. ... Katmai can mean: Katmai National Park and Preserve - a park in Alaska Mount Katmai - a volcano in the Katmai Park in Alaska; the site of a colossal 1912 eruption Katmai - Pentium III computer microprocessor core USS Mount Katmai (AE-16) - an ammunition ship in the US Navy from 1945-1973... Image File history File links Size of this preview: 800 × 532 pixelsFull resolution (3008 × 2000 pixel, file size: 4. ... Image File history File links Size of this preview: 800 × 532 pixelsFull resolution (3008 × 2000 pixel, file size: 4. ... For the mountain in California, see Mount Saint Helena. ... Mount Merapi, Gunung Merapi in Indonesian language, is a conical volcano in Central Java, Indonesia. ... Java (Indonesian, Javanese, and Sundanese: Jawa) is an island of Indonesia, and the site of its capital city, Jakarta. ... Not to be confused with Soufrière (volcano) or La Grande Soufrière. ... For the mountain in California, see Mount Saint Helena. ... For the capital city of the United States, see Washington, D.C.. For other uses, see Washington (disambiguation). ... Lassen Peak[1] (also known as Mount Lassen) is the southernmost active volcano in the Cascade Range. ... Official language(s) English Capital Sacramento Largest city Los Angeles Largest metro area Greater Los Angeles Area  Ranked 3rd  - Total 158,302 sq mi (410,000 km²)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4. ... “Cascades” redirects here. ... For the mountain in California, see Mount Saint Helena. ... Year 1914 (MCMXIV) was a common year starting on Thursday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Wednesday of the 13-day-slower Julian calendar). ... Year 1921 (MCMXXI) was a common year starting on Saturday (link will display the full calendar). ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999...

References

• Global Volcanism Program: Lava Domes
• USGS Photo glossary of volcano terms: Lava dome