Combine the given two facts to write a concluding fact. Note that there should be some parts of the first and second facts that are not mentioned in this conclusion fact. Your combined fact should be the result of a chain between the two facts. Chains form when two facts connect together to produce a concluding fact. An example of a chain is: "pesticides cause pollution" (fact1) + "pollution can harm animals" (fact2) → "pesticides can harm animals" (conclusion fact). Parts of the concluding fact overlap with the first and the second fact. To construct such a  concluding fact, a useful way is to borrow the subject from one fact and the ending conclusions from another fact.

Fact 1: changes in the pH of soil can cause plants to die. 
Fact 2: Sulfur lowers pH in soil.
Adding sulfer to soil can cause plants to die.

Fact 1: adding salt to a liquid decreases the melting point of that liquid. 
Fact 2: Sodium Chloride: It is a table salt .
adding sodium chloride to a liquid decreases the melting point of that liquid.

Fact 1: boiling is when liquids are heated above their boiling point. 
Fact 2: Boiling point is also affected by pressure.

liquids  heated are affected by pressure.