human: <image>
What is it called when water forms this kind of rolling shape?
Answer the question using a single word or phrase.

gpt: wave

human: Are these people in the mountains?

gpt: no

human: Is somebody about to fall?

gpt: no

human: Is this man in the process of falling off of the surfboard?

gpt: no

human: Is the surfer riding a wave?

gpt: yes