Arkeologio: oksigeno
Osigenna scienco kiom vi konas ?
http://news.nationalgeographic.com/2016/05/160511-meteorites-space-earth-atmosphere-oxygen-science/ angla
Osigenna scienco kiom vi konas ?
http://news.nationalgeographic.com/2016/05/160511-meteorites-space-earth-atmosphere-oxygen-science/ angla
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