Laki in the context of "Hydrofluoric acid"

A fissure vent, also known as a volcanic fissure, eruption fissure or simply a fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is often a few metres wide and may be many kilometres long. Fissure vents can cause large flood basalts which run first in lava channels and later in lava tubes. After some time, the eruption tends to become focused at one or more spatter cones. Volcanic cones and their craters that are aligned along a fissure form a crater row. Small fissure vents may not be easily discernible from the air, but the crater rows (see Laki) or the canyons (see Eldgjá) built up by some of them are.

The dikes that feed fissures reach the surface from depths of a few kilometers and connect them to deeper magma reservoirs, often under volcanic centers. Fissures are usually found in or along rifts and rift zones, such as Iceland and the East African Rift. Fissure vents are often part of the structure of shield volcanoes.

The Iceland hotspot is a hotspot that is partly responsible for the high volcanic activity that has formed the Iceland Plateau and the island of Iceland. It contributes to understanding the geological deformation of Iceland.

Iceland is one of the most active volcanic regions in the world, with eruptions occurring on average roughly every three years (in the 20th and 21st century until 2010 there were 45 volcanic eruptions on and around Iceland). About a third of the basaltic lavas erupted in recorded history have been produced by Icelandic eruptions. Notable eruptions have included that of Eldgjá, a fissure of Katla, in 934 (the world's largest basaltic eruption ever witnessed), Laki in 1783 (the world's second largest), and several eruptions beneath ice caps, which have generated devastating glacial bursts, most recently in 2010 after the eruption of Eyjafjallajökull.

The Icelandic horse (Icelandic: íslenski hesturinn [ˈistlɛnscɪ ˈhɛstʏrɪn]), or Icelandic, is a breed of horse developed in Iceland. Although the horses are smaller (at times pony-sized) than other breeds, most registries for the Icelandic refer to it as a horse. The breed is long-lived and hardy, owing to the ruggedness of its home country. In their native Iceland they have few afflictions or diseases, thus national laws are in place preventing foreign-born horses from being imported into the country, while exported animals are not permitted to return. In addition to the gaits of walk, trot, and canter/gallop, typical of other horse breeds, many Icelandic horses can also do the tölt (ambling gait) and the flying pace. The only breed of horse in Iceland, the Icelandic is also popular internationally, and sizable populations exist in Europe and North America. The breed is still used for traditional sheepherding work in its native country, as well as for leisure, showing, and racing.

Developed from ponies brought to Iceland by Norse settlers in the 9th and 10th centuries, the breed is mentioned in various documents from throughout Icelandic history; an early reference to a named-horse appears in the 12th century. Horses were venerated in Germanic religion, a custom brought to Iceland by the country's earliest settlers. Centuries of selective breeding have developed the Icelandic horse into its modern physical form, with natural selection having also played a role in overall hardiness and disease resistance; the harsh Icelandic climate likely eliminated many weaker horses early on due to exposure and malnourishment, with the strongest passing on their genes. In the 1780s, much of the breed was wiped out in the aftermath of a volcanic eruption at Laki. The first breed society for the Icelandic horse was created in Iceland in 1904, and the breed is represented by organizations in 22 different nations as of 2024, organised under a parent association, the International Federation of Icelandic Horse Associations.

The recorded history of Iceland began with the settlement by Viking explorers, mostly Norwegian, and the people they enslaved from Western Europe, particularly the British Isles, in the late ninth century. Iceland was still uninhabited long after the rest of Western Europe had been settled. Recorded settlement has conventionally been dated back to 874, although place names and storytellings indicate Gaelic monks from Ireland, known as papar from sagas, may have settled Iceland earlier.

The land was settled quickly, mainly by Norwegians who may have been fleeing conflict (the unification of Norway) or seeking new land to farm. By 930, the chieftains had established a form of governance, the Althing, making it one of the world's oldest parliaments. Towards the end of the tenth century, Christianity came to Iceland through the influence of the Norwegian king Olaf Tryggvason. During this time, Iceland remained independent, a period known as the Old Commonwealth, and Icelandic historians began to document the nation's history in books referred to as sagas of Icelanders. In the early thirteenth century, the internal conflict known as the age of the Sturlungs weakened Iceland, which eventually became subjugated to Norway over the 13th century. The Old Covenant (1262–1264), and the adoption of Jónsbók (1281) effectively ended the Icelandic Commonwealth. Norway, in turn, was united with Sweden (1319) and then Denmark (1376). Eventually all of the Nordic states were united in one alliance, the Kalmar Union (1397–1523), but on its dissolution, Iceland fell under Danish rule. The subsequent strict Danish–Icelandic Trade Monopoly in the seventeenth and eighteenth centuries was detrimental to the economy. Iceland's resultant poverty was aggravated by severe natural disasters like the Móðuharðindin or "Mist Hardships". During this time, the population declined.