A table lists temperatures (°C) at different depths in an ocean in April: 20°C (0m), 15°C (50m), 10°C (100m), and 5°C (150m). What is the most likely temperature at 75m depth?
Correct: A
The temperature decreases by 5°C every 50m. From 0m to 50m, the drop is 5°C (5°C per 50m = 1°C per 10m). At 75m, halfway between 50m (15°C) and 100m (10°C), the drop would be 2.5°C from 15°C, giving 12.5°C.