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: glass cause refraction of light. 
Fact 2: Refraction Refraction is the bending of light rays.
Glass causes bending of light rays.

Fact 1: when a body of water receives more water than it can hold , a flood occurs. 
Fact 2: Floods are deadly, floods are devastating.
When a body of water receives more water than it can hold, death and devastation can result.

Fact 1: Lions live in social groups called prides. 
Fact 2: Richard the Lion Heart's shield has three lions on it.

Richard's shield has a pride on it.