Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Sometimes deep ocean water rises to the surface. This is called upwelling . The figure below shows why it happens ( Figure below ). Strong winds blow surface water away from shore. This allows deeper water to flow to the surface and take its place. Answer: upwelling
What phenomenon occurs when strong winds blow surface water away from shore, allowing deeper water to flow to the surface and take its place?