Lava domes are formed when erupting lava is too thick to flow and makes a steep-sided mound as the lava piles up near the volcanic vent. Lava domes have formed in Mount St. Helens and experts say a lava dome is growing inside the Shinmoedake volcano in Japan.
Rekingen
Rekingen is a municipality of the district of Zurzach in the canton of Aargau in Switzerland.
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
Volcanic eruption
A volcanic eruption occurs when hot materials from the Earth's interior are thrown out of a volcano. Lava, rocks, dust, and gas compounds are some of these "ejecta".
Eruptions can come from side branches or from the top of the volcano. Some eruptions are terrible explosions that throw out huge amounts of rock and volcanic ash and can kill many people. Some are quiet outflows of hot lava. Several more complex types of volcanic eruptions have been described by volcanologists. These are often named after famous volcanoes where that type of eruption has been seen. Some volcanoes may show only one type of eruption during a period of activity, while others may show a range of types in a series.
The volcanic explosivity index (commonly shortened VEI) is a scale, from 0 to 8, for measuring the strength of eruptions. It is used by the Smithsonian Institution's Global Volcanism Program to assess historic and prehistoric lava flows. It works in a way similar to the Richter scale for earthquakes: each interval in value is a tenfold increase in magnitude (it is logarithmic). Most volcanic eruptions are of VEIs between 0 and 2.
Volcanic eruptions by VEI index
Remetschwil
Remetschwil is a municipality of the district of Baden in the canton of Aargau in Switzerland.
Remigen
Remigen is a municipality of the district of Brugg in the canton of Aargau in Switzerland.
Gifford Pinchot National Forest
The Gifford Pinchot National Forest is a United States National Forest in Washington, USA. It has of land. The forest includes the Mount St. Helens National Volcanic Monument, which takes up of the property.
Rietheim, Switzerland
Rietheim is a municipality of the district of Zurzach in the canton of Aargau in Switzerland.
Cascade Range
The Cascade Range is a mountain range in western North America. It goes from Northern California, through Oregon and Washington, and ends in British Columbia, Canada. The range includes the Western Cascades in northern California and the North and Canadian Cascades in Washington State and Canada.
The highest mountain in the cascades is Mount Rainier at 14,411 feet or 4,392 metres.
The Cascade range was formed by thousands of small, short-lived volcanoes that built a platform of lava and volcanic debris. Rising above this volcanic platform are a few strikingly large volcanoes, like Mount St. Helens, that dominate the landscape.
The fundamental reason for all these mountains on the western side of the Americas is the steady movement of the great landmasses away from Eurasia and Africa. The process of continental drift is fuelled by the production of sea-floor material at the mid-Atlantic trench. The landmasses of the Americas have buckled the edges of the Pacific plates, resulting in the continual volcanic build-up of mountains on the western side of the continents. The Cascade Volcanic Arc made its first appearance 36 million years ago. The major volcanic peaks today were born in the last 1.6 million years. More than 3,000 vents erupted during the most recent volcanic episode that began 5 million years ago. As long as subduction continues, new Cascade volcanoes will continue to rise.
As the oceanic slab sinks deep into the Earth's interior beneath the continental plate, high temperatures and pressures allow water molecules locked in the minerals of solid rock to escape. The water vapor rises into the pliable mantle above the subducting plate, causing some of the mantle to melt. This newly formed magma rises toward the Earth's surface to erupt, forming a chain of volcanoes.
Riniken
Riniken is a municipality of the district of Brugg in the canton of Aargau in Switzerland.
Rohr
Rohr could mean any of the following:
Rohr, Aargau
Rohr is a former municipality of the district of Aarau in the canton of Aargau in Switzerland. Since 2009 Rohr is a part of the municipality and city of Aarau.
Rothrist
Rothrist is a municipality of the district of Zofingen in the canton of Aargau in Switzerland.
Rottenschwil
Rottenschwil is a municipality of the district of Muri in the canton of Aargau in Switzerland.
Rudolfstetten-Friedlisberg
Rudolfstetten-Friedlisberg is a municipality of the district of Bremgarten in the canton of Aargau in Switzerland.
Rüfenach
Rüfenach is a municipality of the district of Brugg in the canton of Aargau in Switzerland.
Coachella Valley Music and Arts Festival
Coachella Valley Music and Arts Festival, best known as just Coachella, is an annual three-day music festival held in Indio, California. It has taken place every year since the first year in 1999, except in the year 2000. It has had artists ranging from Rage Against the Machine to Nickel Creek. The 2014 festival will have 184 artists.
Rümikon
Rümikon is a municipality of the district of Zurzach in the canton of Aargau in Switzerland.
Welwel
Welwel is an oasis in Ethiopia, near Somalia. It used to be called Walwal. Walwal was where a border dispute happened with Italy. Mussolini used the dispute as an excuse to start a war against Ethiopia.
Archers of Loaf
Arctic Cordillera
The Arctic Cordillera is a mountain range running along the northeastern coast of North America from Ellesmere Island to the northernmost tip of Labrador. It is the only major mountain range in Canada east of the Rocky Mountains. The range has a surface area of . Its highest point is at Barbeau Peak.
Fort Banks
Fort Banks (also known as the Eastern Command Fixed Defences), is an old World War II fort that was used to protect the entrance to Botany Bay. The fort is located north of Cape Banks in La Perouse, New South Wales Australia.
Just before WWII, a small section of land on the Cape Banks Headland that was owned by the New South Wales Golf Club was used by the Australian Army to build a fort. The fort was made so that it could protect Sydney from an attack by a foreign navy ship. The fort had two BL 9.2 inch Mark 10 cannons that were put into concrete gun emplacements (pictured) and barracks that were finished just before the start of WWII. During WWII the Henry Head Battery was also reopened and had two BL 6 inch cannons.
Rupperswil
Rupperswil is a municipality of the district of Lenzburg in the canton of Aargau in Switzerland.
Safenwil
Safenwil is a municipality of the district of Zofingen in the canton of Aargau in Switzerland.
Sarmenstorf
Sarmenstorf is a municipality of the district of Bremgarten in the canton of Aargau in Switzerland.
Schafisheim
Schafisheim is a municipality of the district of Lenzburg in the canton of Aargau in Switzerland.
Scherz
Scherz is a former municipality of the district of Brugg in canton of Aargau in Switzerland.
On 1 January 2018 the former municipality of Scherz merged into the municipality of Lupfig.
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
Schinznach-Bad
Schinznach-Bad was a municipality in Brugg in canton of Aargau in Switzerland. On 1 January 2020 Schinznach-Bad became part of Brugg.
Schinznach-Dorf
Schinznach-Dorf is a former municipality of the district of Brugg in canton of Aargau in Switzerland.
On 1 January 2014 the former municipalities of Schinznach-Dorf and Oberflachs merged into the new municipality of Schinznach.
Schlossrued
Schlossrued is a municipality of the district of Kulm in the canton of Aargau in Switzerland.
Schmiedrued
Schmiedrued is a municipality of the district of Kulm in the canton of Aargau in Switzerland.
Schneisingen
Schneisingen is a municipality of the district of Zurzach in the canton of Aargau in Switzerland.
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
Schöftland