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: Weather refers to the conditions of the atmosphere from day to day. 
Fact 2: Earth's Atmosphere Earth's atmosphere is the layer of gasses that surrounds the earth.
weather refers to the conditions in the layer of gasses that surrounds the earth.

Fact 1: fire converts chemical energy into light and heat energy. 
Fact 2: Fuel has a chemical energy.
Fire converts fuel into light and heat energy.

Fact 1: x-rays are used in medical technology. 
Fact 2: Medicine and medical technology help expand our life expectancy.

x-rays are used to help expand our life expectancy.