sentence2_structure: Upwelling<>is<>the term for when deep ocean water rises to the surface$$$deep ocean water<>rises<>to the surface
sentence1: The upwelling along the eastern boundary of the ocean is caused by persistent winds from the northwest that transport water offshore, allowing deeper water to rise to the surface.
sentence2: Upwelling is the term for when deep ocean water rises to the surface.
question: What is the term for when deep ocean water rises to the surface?