Which outcome commonly occurs with prolonged weakening of upwelling currents?

💡 Explanation

Weakened upwelling reduces nutrient transport from the ocean floor; nutrient limitation then causes decreased phytoplankton growth via resource depletion, because this limits primary productivity. Therefore the productivity decreases, rather than a thermocline change or deep water formation, which relate to different density-driven mechanisms.

• Which mechanism explains the formation of composite volcanoes where high-silica magma is involved?
• Which risk increases when a region's groundwater table declines significantly due to elevated evaporative loss during longer summers?
• Which risk substantially increases around composite volcanoes during periods of heightened lava effusion?
• Which process limits stalactite growth with seasonal aridity?
• Which phenomenon shapes lake basins fed by glacial meltwater in previously glaciated landscapes?
• Which effect does latent energy exchange through river flows have on regional climate systems?