A pycnocline is
A) The area of a lake with low dissolved oxygen
B) The area of a lake warmed by the sun and mixed well by the wind
C) In a lake, the point at which photosynthate production equals the energy used up by respiration
D) The boundary between the fresh and salty water in an estuary
E) In a lake, the transition between the epilimnion and the hypolimnion
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A) Areas that are continually
Q14: Chlorophyll concentration is highest in the _
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Q18: Tropical lakes can accumulate large amounts of
Q19: The least productive lakes are called oligotrophic.
Q20: Eventually, eutrophic lakes degrade into oligotrophic lakes.
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