玄武土

例句：

1. 1. The ancient city is built on the basalt soil of the volcano.
   这个古城建在火山的玄武岩土壤上。
2. 2. The basalt rock has been used for thousands of years in construction.
   这种玄武岩岩石几千年来一直在建筑中使用。
3. 3. The basalt rock is a natural resource that can be mined for its minerals.
   玄武岩是一种自然资源，可以开采其矿物。