The Galpagos Islands (official name: Archipilago de Coln, other Spanish names: Islas Galpagos, Spanish pronunciation:[alapaos]) are an archipelago of volcanic islands distributed on either side of the Equator in the Pacific Ocean, 926km (575mi) west of continental Ecuador, of which they are a part.
The Galpagos Islands and their surrounding waters form an Ecuadorian province, a national park, and a biological marine reserve. The principal language on the islands is Spanish. The islands have a population of slightly over 25,000.[1]
The islands are famed for their vast number of endemic species and were studied by Charles Darwin during the voyage of the Beagle. His observations and collections contributed to the inception of Darwin's theory of evolution by natural selection.
The first recorded visit to the islands happened by chance in 1535, when the Dominican friar Fray Tomas de Berlanga went to Peru to arbitrate in a dispute between Francisco Pizarro and his subordinates. De Berlanga was blown off course, though he eventually returned to the Spanish Empire and described the conditions of the islands and the animals that inhabited them. The first navigation chart of the islands was made by the buccaneer Ambrose Cowley in 1684.[dubious discuss] He named the individual islands after some of his fellow pirates or after the British noblemen who helped the privateer's cause. More recently, the Ecuadorian Government gave most of the islands Spanish names. While the Spanish names are official, many users[who?] (especially ecological researchers) continue to use the older English names, principally because those were the names used when Charles Darwin visited[citation needed].
The islands are located in the eastern Pacific Ocean, 973km (525nmi; 605mi) off the west coast of South America. The closest land mass is that of mainland Ecuador, the country to which they belong, 926km/500nmi to the east.
The islands are found at the coordinates 140'N136'S, 8916'9201'W. Straddling the equator, islands in the chain are located in both the northern and southern hemispheres, with Volcn Wolf and Volcn Ecuador on Isla Isabela being directly on the equator. Espaola Island, the southernmost islet of the archipelago, and Darwin Island, the northernmost one, are spread out over a distance of 220km (137mi). The International Hydrographic Organization (IHO) considers them wholly within the South Pacific Ocean, however.[2] The Galpagos Archipelago consists of 7,880km2 (3,040sqmi) of land spread over 45,000km2 (17,000sqmi) of ocean. The largest of the islands, Isabela, measures 2,250 sq mi/5,827km2[3] and makes up close to three-quarters of the total land area of the Galpagos. Volcn Wolf on Isabela is the highest point, with an elevation of 1,707m (5,600ft) above sea level.
The group consists of 18 main islands, 3 smaller islands, and 107 rocks and islets. The islands are located at the Galapagos Triple Junction. The archipelago is located on the Nazca Plate (a tectonic plate), which is moving east/southeast, diving under the South American Plate at a rate of about 2.5 inches (6.4cm) per year.[4] It is also atop the Galapagos hotspot, a place where the Earth's crust is being melted from below by a mantle plume, creating volcanoes. The first islands formed here at least 8million and possibly up to 90million years ago.[5]
While the older islands have disappeared below the sea as they moved away from the mantle plume, the youngest islands, Isabela and Fernandina, are still being formed, with the most recent volcanic eruption in April 2009 where lava from the volcanic island Fernandina started flowing both towards the island's shoreline and into the centre caldera.
The 18[6] main islands (with a land area larger than 1km2) of the archipelago (with their English names) shown alphabetically:
Although located on the Equator, the Humboldt Current brings cold water to the islands, causing frequent drizzles during most of the year. The weather is periodically influenced by the El Nio events, which occur about every 37 years and are characterized by warm sea surface temperatures, a rise in sea level, greater wave action, and a depletion of nutrients in the water.[8]
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Galápagos Islands - Wikipedia, the free encyclopedia
