In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.

[Q]: Fact: a warm front causes cloudy and rainy weather.
[A]: cloudy and rainy weather.


[Q]: Fact: chlorophyll is used for absorbing light energy by plants.
[A]: chlorophyll all green plants.


[Q]: Fact: a firecracker converts chemical energy into sound.
[A]:
chemical energy.