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: if seeds stick to the fur of an animal then that seed will be transported by the animal.
answer:
animal fur seed.


question:
Fact: moss causes chemical weathering.
answer:
chemical weathering is.


question:
Fact: ice wedging is when ice causes rocks to crack by expanding in openings.
answer:

ice expands.