Question

Why do marine animals live deep inside a lake when the surface of the lake freezes?

Answer 1

Some Marine animals migrate to other water bodies. But however oxygen is dissolved in water so the animals can breathe and survive deep in the ocean.

Answer 2

Heya !!!

Here's your answer !!!

During winter , the temperature of the lake water decreases much below 0°C ...

Due to this the top most layers of the water in ponds gets cooled and becomes denser and they sink to the bottom ...

At the same time , water at the bottom which is lighter goes up and after sometime gets cooled and comes to bottom . This process continues till the entire water in lake gets 4°C ...

When the top layers cool further , their temperature falls below 4°C , it expands and becomes lighter . It doesn't sink to bottom and remains at the top...

With further cooling , the top layers gradually form ice at the top . Ice and water are bad conductors of heat . So the lower layers are protected against freezing by the layers of ice and cold water at 1°C , 2°C and 3°C . This results water remaining at 4°C at the bottom of the lake..
So that aquatic animals can survive in those layers of water....


Hope this helps you :)

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