Using the graph below, at what depth does the thermocline begin?
A line graph relating ocean depth to water temperature. At 0 meters, temperature is approximately 27°C. At 50 meters, temperature is approximately 24°C. At 100 meters, temperature is approximately 11°C. At 150 meters, temperature is approximately 8°C.
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0 meters
50 meters
100 meters
150 meters