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A blue miracle in the Eifel: How sapphires formed in volcanoesThe work is published in the journal Contributions to Mineralogy and Petrology. The Eifel is a volcanic region in the center of Europe where magma from the Earth's mantle has been penetrating the ...
The pollen spores found in these samples show, for instance, what the vegetation was like while centimeter-thick layers of volcanic ash testify to the volcanic eruptions in the Eifel region.
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