Make a Comment • Email Link • Send Letter to Editor IPFS News Link • Geology Deep Copper 04-13-2012 • arclein "Both the building blocks for continents and the continental crust itself, dating back as much as 3 billion years, are highly depleted in copper." Watch Streaming Broadcast Live: LRN.fm Watch live shows and archives TV Live Chat Telegram Share this page with your friends on your favorite social network: