Why the water in rivers do not freeze in full (depth) ?

Answer 1

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This is because water is actually densest at 4 degrees Celsius rather than 0 degrees celsius. (Usually, as liquids and gases get warmer, they expand and are less dense). But, water has this unusual property that it gets densest at 4 degrees, so that means within the cold water, the 4 degree water goes to the bottom, and then essentially above it, the 3 degree water, followed by 2 degrees, etc and the 0 degrees floats to the top & there it freezes. So rathern than the water freezing from the bottom up, it freezes from the top down. And, usually when the ice gets thick enough, it provides some insulation for the water that still remains below.

BTW, this is why in many lakes the fish and underwater sealife can live through the winter despite the ice on top.

Answer 2

it is because of the fact water is densest at 4 ranges celsius (quite than 0 ranges Celsius). So, this suggests that when it is chilly, the hotter water (at 4 ranges) is going to the backside, on an identical time as the less warm water (at 0 ranges or so) floats to the precise. consequently, the water freezes from the precise of lake (or river) first allowing the hotter water below to proceed to be water. The frozen ice than acts as a barrier inhibiting something of the water under it. it is why fish & different existence can survive interior the direction of the wintry climate.

Answer 3

Because ice is less dense than liquid water. The ice floats on top and buffers the liquid against the cold air.

Answer 4

They dont freeze because running water doesnt freeze.

Answer 5

The ones that do are called glaciers.