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: a solar panel converts sunlight into electricity. 
Fact 2: Sunlight is composed of photons, or particles of solar energy.
A solar panel converts photons into electricity.

Fact 1: rocks interacting with wind over long periods of time causes weathering. 
Fact 2: Rocks weather at different rates.
wind affects rocks.

Fact 1: dehydrating food is used for preserving food. 
Fact 2: Our Nesco Food Dehydrators require no tray rotation due to a patented air flow system.

Something from Nesco is used for preserving food.