Inside an aquatic environment we can distinguish three scientific terminologies: hypolimnium, thermocline, epilimnium. The most superficial layer corresponds to the epilimnium, a layer that receives more light (photic zone) and which favors the development of phytoplankton (aquatic vegetation) and zooplancton (animals). Epilimnium therefore prevails in the summer season.
On the contrary, we speak of hypolimnium when we are dealing with a deep layer that does not receive light (aphotic zone), therefore a cold layer typical of the winter period. The middle layer is called thermocline, the transition zone between the superficial and the deep layer.
In the thermocline the organic material oxidizes and consequently the water becomes richer in nutrients. This frequently happens in the spring so and here are the animals, the infinite tenderness of the mallards, the loving parental care. A precious gift from Mother Nature, humans, the ruin of planet Earth, should take an example from animals.
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