Gure ortua

Gure ortua

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Airearen propietateak-2

Airearen propietateak 2

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Atmosfera-1

Atmosfera 1

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Ozono geruza-1

Ozono geruza 1

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Atmosferaren kutsadura-1

Atmosferaren kutsadura 1

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Airearen propietateak-1

Airearen propietateak 1

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Atmosfera-2

Atmosfera-2

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