Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Input: Consider Input: Fact: landslides often occur on mountains

Output: It's easy to be crushed by rocks lounging?


Input: Consider Input: Fact: the moon 's surface contains many craters

Output: the moon 's surface contains many?


Input: Consider Input: Fact: sound can be used for communication by animals


Output: Sound can be used for communication by?