Air pollution can cause the ph of soil to decrease.
Incinerated mercury pollutes the air.
Incinerated mercury can cause the ph of soil to decrease.
what can cause the ph of soil to decrease?
Options:
1) Greenhouse gasses
2) contamination
3) fossil fuels
4) chlorofluorocarbons
5) incinerated mercury
6) harmful substances
7) Greenhouse gases
8) Temperature