Plaka tektonikoak
Transcript of Plaka tektonikoak
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PLAKATEKTONIKOAK
(EDO LITOSFERIKOAK)
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DEFINIZIOA
Plaken tektonika Lurraren funtzionamendua azaltzeko teoria.kontinenteak geruza plastiko baten gainean.
geruza ozeanikoa gurutzatuz mugitzen zirela.
Fenomeno honi kontinenteen jitoa deitu zion.
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KONTINENTEEN JITOA
Wegenerren teoria:
20. Mendean Pangea kontinente
bakarra Pangea banandu zen gaur egungo egoerararte.
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GERUZAK
• Lurraren barnealdea geruzatan sailkatua.• Lurraren kampoaldeko 2 geruzak:• (1)LITOSFERA• (2)ASTENOSFERA
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1.LITOSFERA
• Geruzen 1. (100Km-ko lodiera)• 2 zatitan banatuta:• PLAKA KONTINENTALA• PLAKA OZEANIKOA
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1.1 PLAKA KONTINENTALA
• Plaka kontinentaleanGu, landareak,Izaki bizidunak etab.Bizi gara (alde bizia)
1.PLAKA KONTINENTALA.
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1.2 PLAKA OZEANIKOA
• Ozeano guztiak han kokatuak.• P.Kontinentala baino dentsoagoa.• Plaken %70 da.
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2.ASTENOSFERA
• Litosferaren eta mantu artean. (700Km-ko lodiera)
• Litosfera baino bigunagoa.
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PLAKEN MUGAK
• 3 MOTA DAUDE:• DIBERGENTEAK• TRANSFORMATZAILEAK• KOMBERGENTEAK
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DIBERGENTEAK
• Bi plaka bata bestearekiko urruntzean eta lurrazala sortzean.
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TRANSFORMATZAILEAK
• Bi plaka ezberdinek batak-bestearekiko duten ezkerreranzko edo eskuineranzko mugimendua egotean.
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KOMBERGENTEAK
• Bi plaka bata bestearekiko elkartzen direnean.• bata bestearen azpitik sartu.• talka egin.
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BAINO ZERKERAGITEN DITU
PLAKEN MUGIMENDUAK??
¿¿
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• Plaken mugimendua astenosferaren ahultasun erlatiboagaitik.
• Bestalde plaken mugimendua ozeano-erdiko gandorrek duten altuera handiagoa dela eta.
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Beste arrazoi bat
• Ilargiaren mareen eraginez lurreko plakak mendebalderantz mugitzen dira.
• grabitateak Lurraren lurrazala mendebalderantz mugitzen dela esan nahi du.
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