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Why ponds freeze in winter but sea rarely freezes?
In ponds, the water stays more still but in seas the water moves and does not freeze easily.
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Water is rather unique among substances. It increases its density with cooling until it reaches 4 o C (Above freezing) at that time getting cooler lowers its density. As a con…sequence the coldest water floats on top of the above freezing point water. The ice (when it forms) is even less dense and floats at the top of the pond on the colder and warmer water. As a consequence the water that freezes is nearest the top. Even if the water were to be cooled from the bottom, the coldest water would float to the top and when the whole pond became 0Â°C the ice would float to the top as it formed. In some cases where rocks are below the freezing point (exposed to the air part of the time, ice can form and stick to the rocks under water. There is one unusual case where ice crystals form as needle shaped crystals in the water below the surface. This is called frazil ice. These crystals mat together and block inlet pipes and simiar structures. In most ponds, however, the water is losing the majority of its heat to the colder air above it, so the ice would form there. And, being less dense than water, the ice would stay on the top as does the coldest water.
The pond you keep your fish in is above the ground and you are worried about winter that it will freeze right up what can you do?
if it is a cosmetic pond put your fish in an aquarium and drain your pump so it doesn't freeze and break drain your pond
because it have pleanty of salt then lakes and ponds water.
Zero degrees Celsius.
Yes, polar bears depend on the floating sea ice of the Arctic tohunt seals. During summer they are sometimes forced onto land wherethey compete with land bears for small anima…ls and birds which theyare not skilled at trapping.
By turning to ice
One reason is because ponds are fresh water and the ocean is salt water, and salt water freezes a few degrees lower than fresh water. The main reason though is because the oce…an is so deep and constantly being churned by wind and waves, whereas ponds are relatively calm and cannot mix. It is easy to get shallow ponds thoroughly cooled to the freezing point, whereupon the water will freeze. It is much more difficult over the ocean because as soon as the water at the surface cools below a couple degrees Celsius, it becomes denser and sinks, to be replaced by warmer water. Rough seas also break up any attempts for ice crystals to form. It needs to be very cold for a very long time for sea ice to form over the open ocean, and you will never observe that around England.
This depends on your location. The colder it is in your environment, the more depth is needed. Usually in a typical New England town (where I'm from) a natural pond needs to …be deeper than 2 feet to have 0 chance of freezing solid.
Physical Change :)
You de-freeze it.
this winter will be freezing cold like always
When it snows the ice only freezes the top leaving the bottom still water and when you crack that ice the water is still there and the fishes in the sea are still alive. :) i… hoped you have learnt
Fresh water freezes at a higher temperature than salty water does. That is because the dissolved salt has a chemical bond with the water in which it is dissolved, and in order… for water molecules to bond with each other in the freezing process, they first must break the bond that they have with the dissolved salt.
When a pond freezes, the ice floats on top of the liquid water underneath. This allows fish to survive beneath the ice during the winter. The ice also acts as a layer of insul…ation, keeping the water above freezing.
Providing the pond is not too shallow the ice will only freeze on the surface. the fish then move to the lower depths of the pond where their metabolism slows down and they li…ve in a semi- state of hibernation. Your fish should have built up fat reserves in the summer which will see them through this cold spell. Once the ice thaws and the water warms the fish will start eating again. Remember only feed your fish in the summer and stop once the cold weather arrives and you should have healthy fish that will live quite happily through the winter. This answer is right as far as it goes, but the main problem can be a lack of oxygen available to the fish and other wildlife, especially if there is rotting plant etc debris (which can give off toxic gases) in the pond. I would recommend researching this topic more thoroughly if you don't want to risk losing your fish!PS This is Gipsygal speaking - I didn't provide the first answer, just added to it. Not sure how to make this clear! Oh well, I don't suppose it matters, no-one will read it anyway!