Using vertical profiles of temperature (dashed line) and oxygen level (solid line), classify the two lakes Temperature/°C 10 20 0 10 20 10 20 - epilimnion summer thermocline spring. autumn winter Choose. - hypolimnion 12 6. 12 12 Conygen / mg L-1 Temperature/°C 10 20 0 10 20 10 20 epilimnion - thermocline spring. autumn winter sumiper v Choose. oligotropic hypolimnion contaminated clean 6 12 0 6 12 0 6 12 natural eutrophic lake Corygen/ mg L-1

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