Fail:North america craton nps.gif

Selle lehekülje sisule puudub teiste keelte tugi.
Klõps ikoonil viib faili leheküljele Wikimedia Commonsis.
Allikas: Vikipeedia

North_america_craton_nps.gif ‎(512 × 599 pikslit, faili suurus: 32 KB, MIME tüüp: image/gif)

See fail ja sellest kastist allapoole jääv kirjeldus pärinevad kesksest failivaramust Wikimedia Commons. Faili lehekülg Commonsis Faili lehekülg Commonsis
See pilt tuleks konverteerida kasutades vektorgraafikat (SVG-vorming). Vektorkujutisel on mitmeid eeliseid. Konverteerimise kohta vaata täpsemalt siit. Kui sellest pildist on vektorkujutis juba saadaval, siis pane selle malli asemele {{vector version available|uue pildi nimi.svg}}.

North American craton.

The brown area shows the part of the North American continent that has been stable for over 600 million years. This region is made up of a basement older Precambrian metamorphic and igneous rock that is mostly covered by a relatively thin cover of younger sedimentary rock. Geologists call these long-stable continental cores cratons.

The green area on the illustration shows new continental material that was added relatively recently, within the last 600 million years or so. Continents can grow when two plates collide, welding, or accreting, the two pieces together. Continents also grow when oceanic crust is scraped off oceanic plates as they sink in subduction zones.

The purple area fringing the stable continental core is made up of older Precambrian basement that was deformed during plate collisions that occurred within the last 600 million years. The force of collision produced great folds and faults that sometimes penetrated deep into the continental interior. Where the crust was uplifted, these folds and faults are exposed at the surface, allowing geologists to piece together the ancient history of our continent.

http://www2.nature.nps.gov/geology/usgsnps/pltec/nacraton512x599.gif

Source: English Wikipedia, original upload 15 April 2005 by SEWilco


Public domain
See pilt on avalikus omandis, sest pildimaterjal pärineb Ameerika Ühendriikide Siseministeeriumi haldusalas olevast Ameerika Ühendriikide Geoloogiateenistusest. Täpsema teabe jaoks loe geoloogiateenistuse ametlikke autoriõiguspõhimõtteid.

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North American Craton

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viimane16. september 2005, kell 19:06Pisipilt versioonist seisuga 16. september 2005, kell 19:06512 × 599 (32 KB)Saperaud~commonswikiNorth American craton. The brown area shows the part of the North American continent that has been stable for over 600 million years. This region is made up of a basement older Precambrian metamorphic and igneous rock that is most

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