In coastal waters, the upward movement of nutrient-rich water from deeper layers is known as what?

In coastal waters, the upward movement of nutrient-rich water from deeper layers is known as what?

• A. Downwelling
• B. Upwelling
• C. Evaporation
• D. Condensation

Answer: (B)

Upwelling is the vertical movement of nutrient-rich water from deep water up to the surface in coastal areas. Winds along the coast push surface water away, causing deeper, nutrient-daden water to rise to replace it. This influx of nutrients fuels phytoplankton growth, supporting highly productive marine ecosystems and fisheries. It’s distinct from downwelling, where surface water sinks and nutrients aren’t brought to the surface, and from evaporation or condensation, which are atmospheric processes unrelated to this nutrient cycling in the ocean.

Upwelling is the vertical movement of nutrient-rich water from deep water up to the surface in coastal areas. Winds along the coast push surface water away, causing deeper, nutrient-daden water to rise to replace it. This influx of nutrients fuels phytoplankton growth, supporting highly productive marine ecosystems and fisheries. It’s distinct from downwelling, where surface water sinks and nutrients aren’t brought to the surface, and from evaporation or condensation, which are atmospheric processes unrelated to this nutrient cycling in the ocean.