TASK DEFINITION: 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.
PROBLEM: Fact 1: the gravitational pull of the Moon on Earth 's oceans causes the tides. 
Fact 2: Tides create current.

SOLUTION: The gravitational pull of the Moon on Earth's ocean contributes to ocean currents.

PROBLEM: Fact 1: transportation technology is used for moving people. 
Fact 2: People means human beings.

SOLUTION: Human beings use transportation technology to move around.

PROBLEM: Fact 1: gases from burning coal and oil dissolving in water in the atmosphere causes acid rain. 
Fact 2: Coal-fired plants Are power stations which burn coal to generate electricity.

SOLUTION:
power stations which generate electricity produce gases in the atmosphere cause acid rain.