An investigation by the National Museum of Natural Sciences (MNCN-CSIC), the Andalusian Institute of Earth Sciences (IACT-CSIC-UGR) --both of the Higher Council for Scientific Research (CSIC)--, and the University of Salamanca has experimentally shown that the contributions of magma originating from post-subduction events, when one tectonic plate is introduced under another, come from the Earth's mantle and not from recycling the crust, as was thought until now. Article published in La Vanguardia