| 1. | The hypolimnion may be much warmer in lakes at warmer latitudes.
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| 2. | The lowest zone in the lake is the coldest and is called the hypolimnion.
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| 3. | This relieves the downward pressure on the hypolimnion, so cold, dense water flows northward.
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| 4. | As the epilimnion gets thicker, it exerts more and more pressure on the denser hypolimnion below.
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| 5. | Typically the hypolimnion is the coldest layer of a lake in summer, and the warmest layer during winter.
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| 6. | The lake is thus anoxic and has reduced hypolimnion, winter circulation, large phytoplankton and relatively lower animal population.
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| 7. | Many soda lakes are strongly anoxic lower layer ( hypolimnion ), without oxygen and often high concentrations of sulfide.
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| 8. | The two layers of water, the epilimnion and the hypolimnion, on the other hand, differ in density only slightly.
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| 9. | Therefore, the warm top layer, called the epilinmion, tends not to mix with the denser lower layer, the hypolimnion.
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| 10. | In deep, temperate lakes, the bottom-most waters of the hypolimnion are typically close to 4 �C throughout the year.
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