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ID number:396384
 
Author:
Evaluation:
Published: 21.03.2005.
Language: Latvian
Level: Secondary school
Literature: 2 units
References: Not used
Extract

Pasaulē ir apmēram 850 darbīgu vulkānu. Vairums no tiem atrodas jūtīgākajos punktos gar plātņu robežām, kur no Zemes dzīlēm ceļas kvēlojušā magma un sasniedz Zemes virsu. Izplūdušo magmu sauc par lavu . Lavas temperatūra var sasniegt 1500 oC Vulkāni ir kalni, kas rodas izvirduma laikā un ko veido lava un vulkāniskie pelni. Tipisks vulkāns ir paugurs, caur kura centru iet vulkāna kanāls un zem kura atrodas magmas avots. No magmas avota bez centrāla kanāla var atzaroties arī mazāki kanāli – silli un daikas.…

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