Fact 1: Changes in the pH of soil can cause plants to die.

Fact 2: Sulfur lowers pH in soil.

Given the two facts above, answer the question "Adding sulfur to soil can cause what?" with the following options: 
- contamination
 - flooding
 - plants to die
 - Pollution
 - chemical reaction
 - Greenhouse gasses
 - global warming
 - harmful substances


 

   plants to die      