This is a directory service where you can find reputable companies from all different industries. This is to make it easier for you as a consumer to find their way in the jungle of companies out on the internet. Do you want your company to be in our link directory? Click through the link below and easily add your business.
|Economy and Finance||Health & Medical||Travel and tourism||Entertainment and leisure||Society|
|Education||Shopping||Sports||Food and drink||IT|
|Steyning high street closed due to oil spillage|
|Man, 70, quizzed following sex probe at former mountaineering club|
|‘Lorry and cyclist involved in Horsham crash’|
|COUNTY NEWS UPDATE: Man arrested following seven hour stand-off|
|Man ordered to pay back £30,000 for baby milk fraud|
A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot magma, volcanic ash and gases to escape from below the surface. Volcanoes are generally found where tectonic plates are diverging or converging.
A mid-oceanic ridge, for example the Mid-Atlantic Ridge, has examples of volcanoes caused by divergent tectonic plates pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by convergent tectonic plates coming together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another. Volcanoes can also form where there is stretching and thinning of the Earth's crust in the interiors of plates, e.g., in the East African Rift, the Wells Gray-Clearwater volcanic field and the Rio Grande Rift in North America.
This type of volcanism falls under the umbrella of "Plate hypothesis" volcanism. Volcanism away from plate boundaries has also been explained as mantle plumes. These so-called "hotspots", for example Hawaii, are postulated to arise from upwelling diapirs with magma from the core-mantle boundary, 3,000 km deep in the Earth. Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption. Volcanic ash can be a threat to aircraft, in particular those with jet engines where ash particles can be melted by the high operating temperature.
Large eruptions can affect temperature as ash and droplets of sulfuric acid obscure the sun and cool the Earth's lower atmosphere or troposphere; however, they also absorb heat radiated up from the Earth, thereby warming the stratosphere. Historically, so-called volcanic winters have caused catastrophic famines.