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: a delta is formed by deposition of sediment at the mouth of a river by water fanning out.
[EX A]: delta greek.

[EX Q]: Fact: Collar cells have tiny hairs that trap the particles.
[EX A]: Collar cells tiny hairs.

[EX Q]: Fact: carbon dioxide concentrations in the air have increased over the last decade dramatically.
[EX A]:
carbon dioxide CO.