铝土矿全部是风化作用形成的，无一例外。

All of the bauxites are formed by weathering without any exception.

那里的土壤是经过风化作用的石灰石土壤或黄土。

There the soil is from weathered limestone soil or loess .

大部分微量元素，包括锰和砷，通过自然过程中的岩石风化作用进入水体。

Most trace elements, including manganese and arsenic, get into the water through the natural process of rock weathering.

抚顺市煤矸石堆积占全市面积的11.5%，煤矸石的风化作用导致了对环境，特别是对地下水的严重污染。

The total area of coal gangue piles occupies 11.5 percent of the whole area of Fushuncity. The weathering of coal gangue lead to the environment, especially underground water, seriously polluted.