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: condensation causes clouds to form. 
Fact 2: Fog is a cloud that forms on the ground.
condensation causes fog.

Fact 1: a speedometer is used for giving a driver feedback on the speed of their vehicle. 
Fact 2: Speed is the magnitude of velocity.
A speedometer is used for giving feedback on the velocity of a vehicle.

Fact 1: being distracted while driving can cause people to crash their car. 
Fact 2: Car crashes are a leading cause of death.

distracted driving can cause death.