Level curves (isothermals) are shown for the water temperature (in °C) in Long Lake (Minnesota) in 1998 as a function of depth and time of year. Estimate the temperature in the lake on June 9 (day 160) at a depth of 10 m and on June 29 (day 180) at a depth of 5 m. 12 16 20 20 16 12 10- 15 8. 120 160 200 240 280 Day of 1998 Depth (m) 080

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