Water does not only freeze on the top. Given cold enough temperatures for a long enough period of time it would freeze to the bottom. Instead it freezes from the top down. Water freezes on from the top down because ice is less dense than water (H2O). As ice crystals form they rise to the surface.
Demonstration:
See! Ice IS less dense than water!
Some may say that ice is lighter than water, but that's not the whole story! Mass does matter, but so does volume when discussing why objects float.
The density of a substance is found by diving its mass by its volume (the space it takes up). For the space that it takes up, ice has less mass than the liquid water that would fill the same space.
The fact that solid H2O is less dense than liquid H2O is one of the many reasons why water is so unique. No other common substances and very few (if any) uncommon substances have this property. In most matter, the particles are more tightly packed in solid form than in liquid. For crystalline solids, the particles are also more organized in this form. However, water's chemical properties and hydrogen bonds make it more organized but less dense when it is in a solid form. This is because the particles become organized in such a way that there is more empty space between them. This empty space does not contribute to the mass, but it does cause the water to expand.
Demonstration:
Most liquids freeze bottom upwards. This is because the colder liquid is denser, so the portion which freezes is lower down, hence bottom upwards. Conversely, the warmer portion rises and thus the higher part is last to freeze completely.
Sort of. Ice is lighter than water and tends to float. Also, in most natural situations, the atmosphere (in contact with the "top" of a body of water) is colder than the ground underneath the water.
In a freezer where the water is surrounded on all sides by equally cold air, the water freezes from the outside in... top, bottom, sides before the middle.
The top water is always miserable, so when it freezes first, it leaves its life of misery quicker than the bottom water.
Lakes would freeze solid and perhaps kill the fish (unless they adapted to being frozen).
snow melts from the bottom up because heat from the earth rises and melts the snow
beneath and works its way up
I believe they don't.
because it has water in it.
below 5 degrees
Yes, actually, water chestnuts can be frozen. First you would want to put them in a plastic, airtight container to avoid freezer burn.
Liquid water is denser than ice,Ice floats on top of liquid water.
have a lot of pain base of neck top of spine it spreads down my left shoulder
It is part of the water cycle because it help water not just sit on top off a cold mountian and freeze it goes down into a puddle and evaporates
Cold water freezes faster because hot water has to cool down to the freezing temperature before it can freeze.
there is to much preasure down there. ice has to have a way to expand when it frezes. if there is too much water on top of it, it cant expand because of all of the weight.
Depends on the pressure the water is under, but normal water will freeze.
The water can get inside and then freeze which in turn cracks the rocks open.
Ice is less dense than liquid water: Importantly, water bodies freeze from the top down. Water, like all liquids, flows down hill: ultimately maintaining our oceans. Water is an excellent solvent: It dissolves all the chemicals that we need to maintain our bodies.
it freeze at 0degreesCelsius (which is 32 degrees Fahrenheit
No, I think it needs to get down to 0o.
Yes and no. When you try to freeze saltwater it will take much longer than regular water would. Also it will not freeze all the way through it will just have a layer on top.
I freeze water bottles then put them with the bunny and they lay next to it.
Lakes freeze from the top down. Some lakes do freeze all the way to the bottom. The layer of ice and the less dense water below 4oC on the top provides an insulation to prevent the heat in the lower levels from escaping and the lower water does not freeze unless it looses this heat. A long enough, cold enough winter will remove the heat (this is simple thermodynamics) and the entire lake will freeze. Small lakes freeze faster - big lakes slower.
Sea water will not freeze.