Volcanoes: Referees for the life on Earth

170601124203 1 900x600 720x340 - Volcanoes: Referees for the life on Earth
This is a view of a cliff near Tarabuco, in Bolivia. The sedimentary rocks of the Triassic are red whereas the grey rocks at the top of the cliff reveal the sill. Credit: © Hervé BertrandClose

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