Level curves (isothermals) are shown for the typical water temperature (in °C) in Long Lake (Minnesota) as a function of depth and time of year. Estimate the temperature in the lake on September 17 (day 260) at a depth of 10 m and on May 20 (day 140) at a depth of 5 m. 5₂ 10- 15- 12 16 120 day 260 and depth 10 m day 140 and depth 5 m 160 200 240 Day of the year X °℃ x °℃ 280 Ⓡ

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