标签：Geological - 英国华人论坛

The volcanic archipelago we know as the Galapagos Islands is situated almost 1,000kms off the coast of Ecuador, in South America, distributed over both sides of the Equator. With a landscape of extreme diversity and great beauty, the geology...英国华人论坛

These are abundant in the earth (except Promethium). Like copper,Cerium is the 25th most ample (68 parts per million) element. These reservesare scattered, rather than found in clusters and the marketable varieties arecalled ‘rare earth min...英国华人论坛