/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: ManuelRivera20 https://cdn.slidesharecdn.com/profile-photo-ManuelRivera20-48x48.jpg?cb=1523211259 Ing. Geólogo Universidad Nacional de Piura UNP