instruction:
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.
question:
Fact: being exposed to wind can cause erosion of soil.
answer:
being exposed to wind can cause erosion of soil.


question:
Fact: friction causes the temperature of an object to increase.
answer:
friction movement.


question:
Fact: the emission of sulfur dioxide causes acid rain.
answer:

acid rain causes.