sumendiak
TRANSCRIPT
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SUMENDIAK
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Sumendiak lurrazal edo mantuaren gune sakonetatik datozen materialak, oso temperaturaaltuan, kanporantz irteten diren lurrazaleko tokia dira
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Sumendi bat Lurraren gainazalean edo lurrazalean dagoen irekidura bat
da, arroka urtu eta beroa, errautsak eta gasak ateratzen du.
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Sumendi-erupzioak ez dira, lurrikarak bezala erabat suntsikorrak izaten, beti
leku berean gertazten dira
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Lurrikarekin gertatzen den bezala, sumendiek planetako toki
jakin batzuk kaltzen dituzte
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Sumendien podrukturik garrantzitsuena labada, barrualdetik igotzen den magma, gainazelara
heltzean osagai hegazkorrak galtzen dituenaAdibidez: Ura, karbono dioxidoa…
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SUMENDI MOTAK
MAGMAKOA KARBONO DIOXIDOA UR-LURRUNA
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SUMENDIEN SORRERA
Sumendiak orokorrean bi edo hiruplaka tektoniko elkartu edo
bereizten diren lekuetan daude.
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• Beste sumendi batzuk mantuko lumen ondorioz sortzen dira, hauek plaken mugetatik urrun gerta daiteke, Hawaiin bezala. Sumendi mota hauek beste lekuaskotan daude Eguzki Sisteman.
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ILARGIKO SUMENDIAK
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SUMENDIEN JARDUERA
Jarduera bolkanikoarenleherkotasun-maila hainbat
faktoreen mende dago.
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JARDUERA EFUSIBOA-Laba basaltikoa da eta oso tenperatura handian ateratzen da. Gasak ez dira pilatzen.
-Hawaiiarra - Stromboliarra
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JARDUERA LEHERKORRA• Laba oso likatsua da
• Gasak pilatu egiten dira
• Piroklasto ugari sortzen dira
• Lau mota daude:
-Vulkaniarra -Peléearra -Pliniarra -Surtseyarra
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Munduko Sumendirik ezagunak
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Avatxinski-Koriakski, Kamtxatka,
Errusia
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Etna, Sizilian
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• Mauna Loa, Hawaii-en
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Eyjafjallajökull, Islandian
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Teide, Españan
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UR AZPIKO SUMENDIAK
Itsasoaren azpian daude, eta kanpotik arrail luze baten itsura
dute.
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Ur azpiko lubakirik garrantsitzuenaeta sakonena, marianak dira.
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