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Maa kontsentrilised kestad, mis erinevad üksteisest koostise ja tiheduse poolest
Maa sfäärid . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/Maa%20sf%C3%A4%C3%A4rid/1/est (19.06.2026)
