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.

Ex Input:
Fact 1: faulting of rock in Earth 's crust causes earthquakes. 
Fact 2: Fault zones are plates in the earth that slide and collide.

Ex Output:
plates in the earth collide which causes earthquakes.


Ex Input:
Fact 1: tectonic plates being pushed together causes earthquakes. 
Fact 2: Earthquake tremors and volcanic activity are frequent.

Ex Output:
tectonic plates being pushed together causes tremors.


Ex Input:
Fact 1: a doorbell converts electrical energy into sound. 
Fact 2: Alerting devices inform a person when the doorbell rings, alarm clock sounds, or telephone rings.

Ex Output:

Alerting devices inform a person when they convert electrical energy into sound.