SEASON: 1
EPISODE: 21 - Nina and Olli investigate how coal came to be.
Синопсис
Nina and Olli investigate how coal came to be - and discover that the material is made from old trees and plants from many years ago.
SEASON: 1
EPISODE: 21 - Nina and Olli investigate how coal came to be.
Nina and Olli investigate how coal came to be - and discover that the material is made from old trees and plants from many years ago.
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