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Question

Difficulty: MediumWater Cycle and Oceanography

Solar radiation warms the uppermost layer of the ocean, but sunlight cannot penetrate deeply into the water column. Which term identifies the oceanic layer where water temperature drops steeply with increasing depth?

  1. A
    Halocline
  2. ThermoclineAnswer
  3. C
    Pycnocline
  4. D
    Abyssopelagic zone

Answer

Thermocline
The thermocline is the intermediate ocean layer located directly beneath the warm surface mixed layer, characterized by a rapid decrease in water temperature with increasing depth.

Step-by-Step Solution

1
Identify the physical property and gradient described in the question.
The stem describes an oceanic layer defined by a steep decrease in temperature over depth.
Recognizing that the gradient is thermal distinguishes it from salinity and density gradients.
2
Differentiate among oceanic gradient zones by their defining variables.
The thermocline ('thermo' relating to heat and 'cline' meaning gradient) specifically designates the rapid thermal transition zone.
Matching the thermal property directly identifies the thermocline as the correct oceanographic feature.

Key Concept

Oceanic thermal stratification and the thermocline layer
Estimated Time:45s
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Topics

Water Cycle and Oceanography

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