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: being exposed to wind can cause erosion of soil.
being exposed to wind can cause erosion of soil.

Fact: the mass of a planet causes the pull of gravity on that planet.
earth planet.

Fact: Growth is faster during infancy than it is during puberty.

growth adulthood puberty.