- published: 25 Mar 2015
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An atoll (/ˈætɒl/, /ˈætɔːl/, /ˈætoʊl/, /əˈtɒl/, /əˈtɔːl/ or /əˈtoʊl/), sometimes called a coral atoll, is a ring-shaped coral reef including a coral rim that encircles a lagoon partially or completely. There may be coral islands/cays on the rim. The coral of the atoll often sits atop the rim of an extinct seamount or volcano which has eroded or subsided partially beneath the water. The lagoon forms over the volcanic crater or caldera while the higher rim remains above water or at shallow depths that permit the coral to grow and form the reefs. For the atoll to persist, continued erosion or subsidence must be at a rate slow enough to permit reef growth upwards and outwards to replace the lost height.
The word atoll comes from the Dhivehi (an Indo-Aryan language spoken on the Maldive Islands) word atholhu (Dhivehi: އަތޮޅު, [ˈət̪ɔɭu]), meaning an administrative subdivision.OED Its first recorded use in English was in 1625 as atollon – Charles Darwin recognized its indigenous origin and coined, in his The Structure and Distribution of Coral Reefs, the definition of atolls as "circular groups of coral islets" that is synonymous with "lagoon-island".
South Pacific may refer to:
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Atolls begin as an underwater volcanoes called seamounts. Over time and many eruptions the seamount grows until it rises above the water and becomes an island. Corals grow around the island and, over geologic time, the volcano goes dormant and sinks, but the coral reefs remain and continue to grow faster than the island sinks, eventually creating an island ring made of coral around a central lagoon where the volcano used to be. To learn more, check out our online coral reef ecology curriculum: http://www.lof.org/education/portal/
Join Steve and Manjula in the South Pacific. Natural beauty, meets bird and sea life, in the wilds of the South Pacific atolls.
Learn practically 4G(LTE) site planning with Atoll tool.
atoll video for beginners must watch and share with your friends
your 1st step using Atoll this video just to show the effect of changing power , height and tilting So some steps are skipped and another parameters are neglected https://www.facebook.com/waleedelsafoury.fans
Sailing 1,500 miles from Cocos Keeling we make landfall in the remote, exotic paradise that is CHAGOS!!! We quickly discover that the entire atoll is completely deserted and we have the whole place to ourselves. About a dozen islands at our disposal! We cross through the shallow pass into the protected lagoon and begin exploring. We discover a wrecked catamaran on the beach and have some wicked-cool walks in the jungle where we discover all sorts of cool native wildlife including massive coconut crabs. This is our story, a story of three souls sailing around the world. It is a story about sailing, but it's also a story about the fantastic people we meet and amazing places we see. It's a story of people living their lives in an alternate way, in close connection with the beautiful pe...
Пару слов про системы обратного осмоса Atoll A-560E и Atoll A-550 STD
01 Le Photographe exorciste 02 Gazotte 03 Le voleur dextase 04 L'araignee-mal (1)Imazine le temps (2)L'araignee-mal (3)Les robots debiles (4)Le cime tiere de plastique
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Are truly one
All the people on this Earth are truly one