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Volcanic Plugs
A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile-charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption. In a plinian eruption the plug is destroyed and ash is ejected. Glacial erosion can lead to exposure of the plug on one side, while a long slope of material remains on the opposite side. Such landforms are called crag and tail. If a plug is preserved, erosion may remove the surrounding rock while the erosion-resistant plug remains, producing a distinctive upstanding landform. Examples of volcanic plugs Africa Near the village of Rhumsiki in the Far North Province of Cameroon, Kapsiki Peak is an example of a volcanic plug and is one of the most photographed parts of the Mandara Mountains. Spectacular volcanic plugs are present in the center of La Gomer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Garajonay National Park
Garajonay National Park ( es, Parque nacional de Garajonay, ) is located in the center and north of the island of La Gomera, one of the Canary Islands (Spain). It was declared a national park in 1981 and a World Heritage Site by UNESCO in 1986. It occupies 40 km2 (15 sq mi) and it extends into each of the six municipalities on the island. Nearly 450,000 tourists visit the park every year. There is accommodation for tourists just outside the park's boundary. The park is named after the rock formation of Garajonay, the highest point on the island at . It also includes a small plateau whose altitude is 790–1,400 m above sea level. Features of the national park include the massive rocks that are found along the island. These are former volcanoes whose shapes have been carved by erosion. Some, like the "Fortaleza" (fortress in Spanish) were considered sacred by the native islanders, as well as ideal refuges when attacked. The park is crossed by a large network of 18 footpaths ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe and Asia from the "New World" of the Americas in the European perception of the World. The Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Europe and Africa to the east, and North and South America to the west. As one component of the interconnected World Ocean, it is connected in the north to the Arctic Ocean, to the Pacific Ocean in the southwest, the Indian Ocean in the southeast, and the Southern Ocean in the south (other definitions describe the Atlantic as extending southward to Antarctica). The Atlantic Ocean is divided in two parts, by the Equatorial Counter Current, with the North(ern) Atlantic Ocean and the South(ern) Atlantic Ocean split at about 8°N. Scientific explorations of the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Islet
An islet is a very small, often unnamed island. Most definitions are not precise, but some suggest that an islet has little or no vegetation and cannot support human habitation. It may be made of rock, sand and/or hard coral; may be permanent or tidal (i.e. surfaced reef or seamount); and may exist in the sea, lakes, rivers or any other sizeable bodies of water. Definition As suggested by its origin ''islette'', an Old French diminutive of "isle", use of the term implies small size, but little attention is given to drawing an upper limit on its applicability. The World Landforms website says, "An islet landform is generally considered to be a rock or small island that has little vegetation and cannot sustain human habitation", and further that size may vary from a few square feet to several square miles, with no specific rule pertaining to size. Other terms * Ait (/eɪt/, like eight) or eyot (/aɪ(ə)t, eɪt/), a small island. It is especially used to refer to river i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rockall
Rockall () is an uninhabitable granite islet situated in the North Atlantic Ocean. The United Kingdom claims that Rockall lies within its exclusive economic zone (EEZ) and is part of its territory, but this claim is not recognised by Ireland. It and the nearby skerries of Hasselwood Rock and Helen's Reef are the only emergent parts of the Rockall Plateau. The rock was formed by magmatism as part of the North Atlantic Igneous Province during the Paleogene. Rockall's approximate distances from the closest islands in each direction are as follows: It is west of Soay, Scotland; northwest of Tory Island, Ireland; and south of Iceland. The nearest permanently inhabited place is North Uist, an island in the Outer Hebrides of Scotland, to the east. The United Kingdom claimed Rockall in 1955 and incorporated it as a part of Scotland in 1972. The UK does not make a claim to extended EEZ based on Rockall, as it has ratified the United Nations Convention on the Law of the Sea (UNCLOS ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aeolian Islands
The Aeolian Islands ( ; it, Isole Eolie ; scn, Ìsuli Eoli), sometimes referred to as the Lipari Islands or Lipari group ( , ) after their largest island, are a volcanic archipelago in the Tyrrhenian Sea north of Sicily, said to be named after Aeolus, the mythical ruler of the winds. The islands' inhabitants are known as Aeolians ( it, Eoliani, links=no). The islands had a permanent population of 14,224 at the 2011 census; the latest official estimate is 15,419 as of 1 January 2019. The Aeolian Islands are a popular tourist destination in the summer and attract up to 600,000 visitors annually. There are seven significant islands: Lipari, Vulcano, Salina, Stromboli, Filicudi, Alicudi and Panarea, and a set of minor islands and rocks. Geography The ''Lipari Islands'' are 30 km and 80 km off the north coast of Sicily in the Tyrrhenian Sea. Vulcano is located closest to the Sicilian coast. Lipari and Salina follow to the north, Filicudi and Alicudi to the west, and Pan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strombolicchio
Strombolicchio () is a sea stack of volcanic origin to the northeast of the island of Stromboli in the Aeolian Islands of Italy. Its name in the Sicilian language, ''Struognulicchiu,'' means ''Little Stromboli''. Geology Geologically, Strombolicchio is a volcanic plug or spine of extremely hard compacted basalt resistant to erosion, and is the remnant of the original volcano from which the island of Stromboli was built up. Eruptions at this site ceased approximately 200,000 years ago. Since then the volcanic activity has moved about to the southwest. It is the only remnant above sea level of an otherwise submarine platform that extends between it and the main island. Flora and fauna Strombolicchio hosts some very rare species of flora and fauna and has been declared a natural reserve, with severe restrictions on access. '' Bassia saxicola'', for example, an endangered flower at risk of extinction, is otherwise present in only a few hundred specimens on the island of Capri. '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Czech Republic
The Czech Republic, or simply Czechia, is a landlocked country in Central Europe. Historically known as Bohemia, it is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the southeast. The Czech Republic has a hilly landscape that covers an area of with a mostly temperate continental and oceanic climate. The capital and largest city is Prague; other major cities and urban areas include Brno, Ostrava, Plzeň and Liberec. The Duchy of Bohemia was founded in the late 9th century under Great Moravia. It was formally recognized as an Imperial State of the Holy Roman Empire in 1002 and became a kingdom in 1198. Following the Battle of Mohács in 1526, the whole Crown of Bohemia was gradually integrated into the Habsburg monarchy. The Protestant Bohemian Revolt led to the Thirty Years' War. After the Battle of White Mountain, the Habsburgs consolidated their rule. With the dissolution of the Holy Empire in 1806, the Cro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trosky Castle
Trosky Castle ( cs, Hrad Trosky) is a castle ruin in the municipality of Troskovice in the Liberec Region of the Czech Republic. It lies about south of Semily. It is located on the summits of two basalt volcanic plugs. On the lower peak, , is the two-storey structure called ''Baba'' (Crone), and on the higher outcrop, , is the four-sided structure known as ''Panna'' (Maiden). The castle is a landmark of the Bohemian Paradise region. History The castle was established by Čeněk of Wartenberg in the second half of the 14th century.Tomaš Ehrenberger, ''The 88 Most Beautiful Castles'', pg. 133, Kartografie Praha a.s., Two towers were constructed, one on top of each rock, and various residential buildings and outhouses were erected between them. Three rings of fortified walls protected the complex. After Čeněk's death the castle came into the possession of King Wenceslaus IV, from whom it was acquired by Otto III of Bergau. Though Otto IV of Bergau was a zealous Catholic, it d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Le Puy-en-Velay
Le Puy-en-Velay (, literally ''Le Puy in Velay''; oc, Lo Puèi de Velai ) is the prefecture of the Haute-Loire department in the Auvergne-Rhône-Alpes region of south-central France. Located near the river Loire, the city is famous for its cathedral, for a kind of lentil, for its lace-making, as well as for being the origin of the ''Chemin du Puy,'' one of the principal origin points of the pilgrimage route of Santiago de Compostela in France. In 2017, the commune had a population of 18,995. History Le Puy-en-Velay was a major bishopric by the early period of medieval France. Its foundation is largely legendary. According to a martyrology compiled by Ado of Vienne, published in many copies in 858, and supplemented in the mid-10th century by Gauzbert of Limoges, a priest named George accompanied a certain Front, the first Bishop of Périgueux, when they were sent to proselytize in Gaul. Front was added to the list of the apostles to Gaul, who in tradition are described as be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint Michel D'Aiguilhe
Saint-Michel d'Aiguilhe (St. Michael of the Needle) is a chapel in Aiguilhe, near Le Puy-en-Velay, France. The chapel is reached by 268 steps carved into the rock. It was built in 969 on a volcanic plug high. The surface on top of the plug is 57 metres (187 ft) in diameter. Bishop Godescalc of Le Puy-en-Velay had the chapel built to celebrate his return from the pilgrimage of Saint James in 951. The chapel is dedicated to the Archangel Michael, the patron of mountaintops and other high places. A prehistoric dolmen dedicated to Mercury by the Romans was built on the volcanic plug before the construction of the chapel. Three stones from this dolmen are said to be incorporated into the chapel. In the 12th century, the chapel was enlarged, and a nave, ambulatory, two side chapels, a narthex, a carved portal, more frescoes, and a bell tower were added. The bell tower was built in the style of the nearby Cathedral Notre-Dame-du-Puy. In 1429, the mother of Joan of Arc, Isabell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motta Sant'Anastasia
Motta Sant'Anastasia () is a ''comune'' (municipality) in the Metropolitan City of Catania in the Italian region Sicily, located about southeast of Palermo and about west of Catania. Geography Motta Sant'Anastasia borders the following municipalities: Belpasso, Camporotondo Etneo, Catania, Misterbianco. The oldest part of Motta Sant'Anastasia was built on a volcanic plug. A long and intense eruption dating back to 550,000 years ago caused the formation of this volcanic cone. Over the centuries, through erosion the cone has acquired its current shape having a quasi-regular, prismatic-hexagonal and pentagonal section, reaching a height of . The vegetation on the rock is made up of lichens and Indian fig (''Opuntia ficus-indica''), originally from Mexico but naturalized in the Mediterranean basin. History Motta, like other cities in the Simeto Valley, has ancient origins. Archaeological studies dating back to 1954 in contrada Ardizzone, testify Greek presence in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
