What is the process called when deep, cold ocean water rises toward the surface, replacing displaced surface water with cold, nutrient-rich water that wells up from below?

What the question is describing

You are looking for the ocean process where surface water moves away, and deeper water rises to take its place.

Key idea: surface water is replaced

When wind and currents displace surface water, that water has to be replaced somehow. The ocean “pulls up” water from deeper layers to fill the gap.

Why the rising water matters

Deep water is typically colder and contains lots of dissolved nutrients (like nitrates and phosphates) that have built up from decomposing organisms. When this nutrient-rich water reaches the surface, it can fuel plankton growth and support productive fisheries.

Vocabulary match

The term for this “welling up” of deep, cold, nutrient-rich water is upwelling.