地殼的金屬含量

The following is the list of ranking of abundance of metals on earth:
1. Aluminum 鋁 8.13%
2. Iron 鐵 5.00%
3. Calcium 鈣 3.63%
4. Sodium 鈉 2.83%
5. Potassium 鉀 2.59%

For more information, check out the chinese wiki site:
http://zh.wikipedia.org/zh-hk/%E5%9C%B0%E7%90%83%E7%9A%84%E5%9C%B0%E6%AE%BC%E5%85%83%E7%B4%A0%E8%B1%90%E5%BA%A6%E5%88%97%E8%A1%A8

補充:
銅、鍚、汞...