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ID number:998173
 
Author:
Evaluation:
Published: 25.05.2007.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Zem Zemes garozas vidēji no 35 līdz 2900 km dziļumam atrodas mantija, kur pēc seismisko viļņu izplatīšanās rakstura iedala B, C un D slāņos. Parasti B un C slāņus apvieno un sauc par augšējo mantiju. B slānis sastāv no galvenokārt no kramskābes, dzelzs un magnija, tā sastāvs atbilst ultrabāziskiem iežiem – periodītiem, kuros daudz Na, K un Ca (dažiem uz Zemes atrastiem meteorītiem ir līdzīgs sastāvs). …

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