Ur (continent)

Ur (continent)

Ur is the first known continent that probably formed 3 billion years ago in the early Archean Eon. Ur joined with the continents Nena and Atlantica about one billion years ago to form the supercontinent Rodinia. Ur survived for a long time, until it was first torn apart when the supercontinent Pangaea broke apart about 208 million years ago into Laurasia and Gondwana. It now forms parts of Africa, Australia, India, and Madagascar. In the early period of its existence, it was probably the only continent on Earth, and is so considered by some to be a supercontinent, even though it was probably smaller than Australia is now.

History of Ur

* ~3 billion years ago, Ur formed as the only continent on Earth.
* ~1 billion years ago, Ur was a part of the major supercontinent Rodinia.
* ~300 million years ago, Ur was a part of the major supercontinent Pangea.
* ~208 million years ago, Ur was torn apart into parts of Laurasia and Gondwana.
* ~65 million years ago, the African part of Ur was torn apart as part of India.
* ~Present, Ur is part of Australia and Madagascar.

References

* [http://research.unc.edu/endeavors/spr97/ur.html In the beginning, there was Ur]
* [http://findarticles.com/p/articles/mi_m1511/is_n1_v18/ai_18974441 Carl Zimmer, "In times of Ur - The Top 100 Science Stories of 1996 - Earth's first continent", Discover, Jan, 1997]


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Continent (horse) — Continent Sire Lake Coniston Grandsire Bluebird Dam Krisia Damsire Kris Sex Gelding Foaled …   Wikipedia

  • Continent-Colore — Continent Coloré Le Continent Coloré Un univers de fiction Genres Fantastique Thèmes • Innocence • Naïveté • Paix • Complot …   Wikipédia en Français

  • Continent Australien — La plaque continentale australienne (en bleu clair)comprend la Nouvelle Guinée mais pas les îles du Pacifique comme la Nouvelle Zélande. En géologie, le continent australien (appelé aussi Australie Nouvelle Guinée, Sahul, Meganesia, Grande… …   Wikipédia en Français

  • continent — continent, ente 1. (kon ti nan, nan t ) adj. 1°   Qui observe la continence.    Substantivement. •   L exemple de la chasteté d Alexandre n a pas tant fait de continents que...., PASC. P. div. 107.    Les Continents, nom d une secte hérétique qui …   Dictionnaire de la Langue Française d'Émile Littré

  • Continent — Con ti*nent, n. [L. continens, prop., a holding together: cf. F. continent. See {Continent}, a.] 1. That which contains anything; a receptacle. [Obs.] [1913 Webster] The smaller continent which we call a pipkin. Bp. Kennet. [1913 Webster] 2. One… …   The Collaborative International Dictionary of English

  • Continent (Hypermarché) — Logo de Continent Création 1972 Dates clés 1999 : fusion avec le groupe Carrefour Disparition …   Wikipédia en Français

  • Continent (hypermarche) — Continent (hypermarché) Logo de Continent Création 1972 Dates clés 1999 : fusion avec le groupe Carrefour Disparition …   Wikipédia en Français

  • continent — con‧ti‧nent [ˈkɒntnənt ǁ ˈkɑːn ] noun [countable] 1. one of the seven large masses of land in the world: • the continents of Asia and Africa 2. the Continent used to refer to Western Europe not including Britain: • There is now greater co… …   Financial and business terms

  • Continent — Con ti*nent, a. [L. continens, entis, prop., p. pr. of continere to hold together, to repress: cf. F. continent. See {Contain}.] 1. Serving to restrain or limit; restraining; opposing. [Obs.] Shak. [1913 Webster] 2. Exercising restraint as to the …   The Collaborative International Dictionary of English

  • Continent (Homonymie) — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Continent est une vaste étendue continue de terre à la surface du globe terrestre. Continent était le nom d une enseigne d hypermarchés en France.… …   Wikipédia en Français

  • Continent Perdu — (titre original : Continente perduto) est un film italien réalisé par Leonardo Bonzi, Enrico Gras et Giorgio Moser, sorti en 1954. Sommaire 1 Synopsis 2 Fiche technique 3 Récompenses …   Wikipédia en Français

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”