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.

Fact: a sandbar is formed by water moving sediment downstream.
sandbar habitat.

Fact: Some herbivores have more than one stomach.
cows stomach.

Fact: carpooling decreases the amount of cars used to travel to a place.

carpool.