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← GeographyWhich outcome occurs as geothermal vent discharge declines?
A)Chemosynthetic productivity will dramatically decrease.✓
B)Abyssal plain sediments accumulate rapidly.
C)Methane hydrate deposits become more stable.
D)Seawater density locally equalizes vertically.
💡 Explanation
Chemosynthetic productivity drops because hydrothermal vent ecosystems rely on chemosynthesis fueled by vent discharge. The mixing of sulfide-rich fluid results in chemosynthesis, therefore productivity decreases when the driver diminishes, rather than increased sediment accumulation.
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