I am not 100% on this but crest is usually associated with a wave so if there is an answer for a wave I would go with that
Hello,
Considering I don't know what text you're referring to, I'll just answer the question as defining it.
A refugee can be defined as a person who is forced to leave their country to escape war, persecution, or a natural disaster.
Answer:
Ice cracks a rock
Explanation:
I could also plant roots break rock but its more likely to be ice.