Marco "Sully" Perez - Sand and gravel are the two most-extracted materials in the world, even beyond fossil fuels and biomass. It is a key ingredient for roads, concrete, glass and electronics, and large amounts of sand are used for land reclamation, beach renourishment and shale gas extraction.<br /><br />Follow us on:<br />https://soundcloud.com/marcosullyperez/<br />https://issuu.com/marcosullyperez<br />https://marcosullyperez.blogspot.com<br /><br />
