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Vitória-Trindade Ridge
The Vitória-Trindade Ridge is a 1200 km long ridge in the western part of the South Atlantic at around 20 degrees south latitude and which is composed of a series of seamounts and islands. It extends from 40 degrees west on the Brazil coast to 29 degrees west. It is composed of magmatic rocks and is scientifically considered to be the volcanic track of a mantle plume impinging on the South American tectonic plate which has thrown up a series of volcanic cones over the last 140 million years since the start of the Cretaceous period. The rocks are formed of an alkaline basalt. The ridge forms a west–east-trending line of submerged mounts and banks that extends from the Brazilian eastern continental shelf around the state of Espirito Santo and stretches out into the deep-water portion of the southern Atlantic Ocean. The Trindade Archipelago, located 1200 km away from the coastline, forms its eastern terminus. The ridge only breaks the surface of the South Atlantic to f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ilha Martim Vaz (51986627034) , an island and populated place of the coast of mainland Mozambique
{{geodis ...
Ilha (Portuguese for "island") may refer to the following places in Portugal or Mozambique: *Ilha (Santana), a parish in the municipality of Santana, Madeira *Ilha (Pombal), a former parish in the municipality of Pombal *Island of Mozambique The Island of Mozambique () lies off northern Mozambique, between the Mozambique Channel and Mossuril Bay, and is part of Nampula Province. Prior to 1898, it was the capital of colonial Portuguese East Africa. With its rich history and sandy b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seamount
A seamount is a large submarine landform that rises from the ocean floor without reaching the water surface (sea level), and thus is not an island, islet, or cliff-rock. Seamounts are typically formed from extinct volcanoes that rise abruptly and are usually found rising from the seafloor to in height. They are defined by oceanographers as independent features that rise to at least above the seafloor, characteristically of conical form.IHO, 2008. Standardization of Undersea Feature Names: Guidelines Proposal form Terminology, 4th ed. International Hydrographic Organization and Intergovernmental Oceanographic Commission, Monaco. The peaks are often found hundreds to thousands of meters below the surface, and are therefore considered to be within the deep sea. During their evolution over geologic time, the largest seamounts may reach the sea surface where wave action erodes the summit to form a flat surface. After they have subsided and sunk below the sea surface, such flat-top ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Igneous Rock
Igneous rock ( ), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or without crystallization to form natural glasses. Igneous rocks occur in a wide range of geological settings: shields, platforms, orogens, basins, large igneous provinces, extended crust and oceanic crust. Geological significance Igneous and metamorphic rocks make up 90–95% of the top of the Earth's crust by volume. Igneous rock ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mantle Plume
A mantle plume is a proposed mechanism of convection within the Earth's mantle, hypothesized to explain anomalous volcanism. Because the plume head partially melts on reaching shallow depths, a plume is often invoked as the cause of volcanic hotspots, such as Hawaii or Iceland, and large igneous provinces such as the Deccan and Siberian Traps. Some such volcanic regions lie far from tectonic plate boundaries, while others represent unusually large-volume volcanism near plate boundaries. Concepts Mantle plumes were first proposed by J. Tuzo Wilson in 1963 and further developed by W. Jason Morgan in 1971 and 1972. A mantle plume is posited to exist where super-heated material forms ( nucleates) at the core-mantle boundary and rises through the Earth's mantle. Rather than a continuous stream, plumes should be viewed as a series of hot bubbles of material. Reaching the brittle upper Earth's crust they form diapirs. These diapirs are "hotspots" in the crust. In particular, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South American Plate
The South American plate is a major tectonic plate which includes the continent of South America as well as a sizable region of the Atlantic Ocean seabed extending eastward to the African plate, with which it forms the southern part of the Mid-Atlantic Ridge. The easterly edge is a divergent boundary with the African plate; the southerly edge is a complex boundary with the Antarctic plate, the Scotia plate, and the Sandwich Plate; the westerly edge is a convergent boundary with the subducting Nazca plate; and the northerly edge is a boundary with the Caribbean plate and the oceanic crust of the North American plate. At the Chile triple junction, near the west coast of the Taitao– Tres Montes Peninsula, an oceanic ridge known as the Chile Rise is actively subducting under the South American plate. Geological research suggests that the South American plate is moving west away from the Mid-Atlantic Ridge: "Parts of the plate boundaries consisting of alternations of re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tectonic Plate
Plate tectonics (, ) is the scientific theory that the Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since 3–4 billion years ago. The model builds on the concept of , an idea developed during the first decades of the 20th century. Plate tectonics came to be accepted by geoscientists after seafloor spreading was validated in the mid-to-late 1960s. The processes that result in plates and shape Earth's crust are called ''tectonics''. Tectonic plates also occur in other planets and moons. Earth's lithosphere, the rigid outer shell of the planet including the crust and upper mantle, is fractured into seven or eight major plates (depending on how they are defined) and many minor plates or "platelets". Where the plates meet, their relative motion determines the type of plate boundary (or fault): , , or . The relative movement of the plates typically ranges from zero to 10 cm annually. Faults tend to be geologically active, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ninth and longest geological period of the entire Phanerozoic. The name is derived from the Latin , 'chalk', which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation . The Cretaceous was a period with a relatively warm climate, resulting in high Sea level#Local and eustatic, eustatic sea levels that created numerous shallow Inland sea (geology), inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was largely ice-free, although there is some evidence of brief periods of glaciation during the cooler first half, and forests extended to the poles. Many of the dominant taxonomic gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Continental Shelf
A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods. The shelf surrounding an island is known as an "''insular shelf''." The continental margin, between the continental shelf and the abyssal plain, comprises a steep continental slope, surrounded by the flatter continental rise, in which sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of the slope. Extending as far as 500 km (310 mi) from the slope, it consists of thick sediments deposited by turbidity currents from the shelf and slope. The continental rise's gradient is intermediate between the gradients of the slope and the shelf. Under the United Nations Convention on the Law of the Sea, the name continental shelf was given a legal definition as the stretch of the seabed adjacent to the shores ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Federative Units Of Brazil
The federative units of Brazil () are subnational entities with a certain degree of autonomy (self-government, self-regulation, and self-collection) and endowed with their own government and constitution, which together form the Brazil, Federative Republic of Brazil. There are #List, 26 states (') and Federal District (Brazil), one federal district ('). The states are generally based on historical, conventional borders which have developed over time. The states are divided into municipalities of Brazil, municipalities, while the Federal District (Brazil), Federal District assumes the competences of both a state and a municipality. Government The government of each state of Brazil is divided into executive branch, executive, legislative branch, legislative and judiciary branches. The state executive branch is headed by a state governor and includes a vice governor, both elected by the citizens of the state. The governor appoints several secretaries of state (each one in charge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Espírito Santo
Espírito Santo (; ) is a state in southeastern Brazil. Its capital is Vitória, and its largest city is Serra. With an extensive coastline, the state hosts some of the country's main ports, and its beaches are significant tourist attractions. The state is divided into 78 municipalities. The capital, Vitória, is located on an island, which borders the municipalities of Vila Velha, Cariacica, and Serra. These municipalities, plus the outer cities of Fundão and Guarapari, constitute the state's main metro area. In the northern extremes of Espírito Santo is Itaúnas, in the municipality of Conceição da Barra, which is a tourist location known for its sand dunes and forró tradition. The Captaincy of Espírito Santo was carved out of the Captaincy of Bahia in the 18th century, during the colonial rule of Brazil, and named after a 16th-century captaincy covering roughly the same area of coast. Following the elevation of Brazil to a constituent kingdom of the Un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Ocean
The Atlantic Ocean is the second largest of the world's five borders of the oceans, oceanic divisions, with an area of about . It covers approximately 17% of Earth#Surface, Earth's surface and about 24% of its water surface area. During the Age of Discovery, it was known for separating the New World of the Americas (North America and South America) from the Old World of Afro-Eurasia (Africa, Asia, and Europe). Through its separation of Afro-Eurasia from the Americas, the Atlantic Ocean has played a central role in the development of human society, globalization, and the histories of many nations. While the Norse colonization of North America, Norse were the first known humans to cross the Atlantic, it was the expedition of Christopher Columbus in 1492 that proved to be the most consequential. Columbus's expedition ushered in an Age of Discovery, age of exploration and colonization of the Americas by European powers, most notably Portuguese Empire, Portugal, Spanish Empire, Sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trindade And Martim Vaz
Trindade and Martim Vaz (, ) is an archipelago located in the South Atlantic Ocean about east off the coast of the Brazilian state of Espírito Santo, of which it forms a part. The archipelago has a total area of and a navy-supported research station of up to 8 persons. The archipelago consists of five islands and several rock (landform), rocks and stack (geology), stacks; Trindade is the largest island, with an area of ; about east of it are the tiny Martim Vaz islets, with a total area of . The islands are of volcanic origin and have rugged terrain; the date of last eruption in the island is unknown, but occurred on the southeastern tip of the island at Vulcão de Paredão. They are largely barren, except for the southern part of Trindade. They were discovered in 1502 by Portuguese explorer Estêvão da Gama (c. 1470), Estêvão da Gama and stayed Portuguese until they became part of Brazil at its Independence of Brazil, independence in 1822. From 1895 to 1896, Trindade was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
