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.

[EX Q]: Fact: being exposed to wind can cause erosion of soil.
[EX A]: being exposed to wind can cause erosion of soil.

[EX Q]: Fact: stalactites are formed by deposition.
[EX A]: deposition sand limestone.

[EX Q]: Fact: the Earth revolving around the Sun causes the seasons to change on its axis.
[EX A]:
earth axis.