Write a fact related to the given fact, based on the given topic word. Note that, your fact should have at least one word in common with the given fact. All facts in this task refer to scientific facts. Your related fact must form a chain with the given fact. Chains form when two facts connect together to produce the third fact. An example of a chain is: "pesticides cause pollution" (given fact) + "pollution can harm animals" (related fact) → "pesticides can harm animals" (connected chain). Avoid creating simple paraphrases of the given fact. While your generated fact should be related to the input fact, they must describe slightly different scientific phenomena. It's okay if your related fact includes some irrelevant information, provided that it has some overlap with the given fact and it contains some words corresponding to the provided topic.

Example Input: Fact: Active immunity results when an immune response to a pathogen produces memory cells. 
Topic: immune system keeps people from getting sick.
Example Output: People with weaker immune systems are more likely to get sick from contaminated foods.

Example Input: Fact: weathering means breaking down rocks from larger whole into smaller pieces by weather. 
Topic: weathering water.
Example Output: Water is a mechanical weathering force.

Example Input: Fact: coal is used for generating heat by burning. 
Topic: coal is made from dead animals.
Example Output:
Coal forms from dead plants, compacted.