동아사이언스

박테리아 광부들

과학동아 1990년 08호

The Phoenicians traveled vout into the Atlantic Ocean and discovered tin ore in the 'Tin Isles,' which may have been Cornwall in England, and grew rich by monopolizing this valuable material until iron made it comparatively obsolete.Since then, human beings have searched the world over for natural concentrations of ores containing desirable metals. It was not only a matter of gold, silver, ...