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Why dont we have frozen Oceans if...


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#16    spacecowboy342

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Posted 02 September 2013 - 12:34 AM

View PostFrank Merton, on 02 September 2013 - 12:30 AM, said:

Well whatever happens when the ice sheets melts, I doubt we will like it.
Especially if you own beachfront property


#17    TheVeryFirstDinosaur

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Posted 02 September 2013 - 01:34 AM

Cause Gawd made it dat way


#18    Waspie_Dwarf

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Posted 02 September 2013 - 06:50 AM

As well as the reasons given to you, water has another, unusual property. In most cases the solid phase of a chemical is more dense than the liquid. When you start to freeze it the ice sinks to the bottom and the freezing process occurs from the bottom upwards. The sinking of the ice (and the colder, more dense, liquid near freezing point) help to cools the entire liquid.

This does not happen with water. Water is at its most dense at around 4oC, whilst still liquid. This means that the ice floats at the surface. Warmer water sinks. This is why fresh water lakes (and even fish ponds if they are deep enough) do not freeze solid even when the air temperature is well below freezing. If the body if water is deep enough the temperature at the bottom will remain at 4oC.

Edited by Waspie_Dwarf, 02 September 2013 - 06:53 AM.

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#19    spacecowboy342

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Posted 02 September 2013 - 07:00 AM

View PostWaspie_Dwarf, on 02 September 2013 - 06:50 AM, said:

As well as the reasons given to you, water has another, unusual property. In most cases the solid phase of a chemical is more dense than the liquid. When you start to freeze it the ice sinks to the bottom and the freezing process occurs from the bottom upwards. The sinking of the ice (and the colder, more dense, liquid near freezing point) help to cools the entire liquid.

This does not happen with water. Water is at its most dense at around 4oC, whilst still liquid. This means that the ice floats at the surface. Warmer water sinks. This is why fresh water lakes (and even fish ponds if they are deep enough) do not freeze solid even when the air temperature is well below freezing. If the body if water is deep enough the temperature at the bottom will remain at 4oC.
I had a teacher in school tell me that were it not for that property of water there would be no life on earth as the only reason life survived on the early earth was that bodies of water didn't completely freeze


#20    questionmark

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Posted 02 September 2013 - 01:41 PM

Because it is not sufficient that the air temperature is 0, you also need distilled water at that temperature in all layers. Depending on the aggregates to the water it may not freeze until -40 C (i.e. antifreeze).

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#21    raven3322

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Posted 02 September 2013 - 06:19 PM

the Water molecule is In Constant flux  from vapor A liquid A solid  sates The salt reaction with the molecules


#22    Big Bad Voodoo

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Posted 02 September 2013 - 07:39 PM

Okay. One mystery solved. Thanks Umers!

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#23    cacoseraph

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Posted 02 September 2013 - 09:49 PM

And now that the science is understood, it is time for the Icy Finger of Death!




Also, only the south pole melting will appreciably raise the ocean levels.  Since their is no land at the north pole all the ice is floating on the water.  Since the amount of ice that floats above the waterline is equivalent to the volume chance when the ice freezes, as the ice melts you don't get any net change in water level.


#24    spacecowboy342

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Posted 02 September 2013 - 09:54 PM

Don't forget Greenland icesheet


#25    cacoseraph

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Posted 02 September 2013 - 09:59 PM

I thought that was partly inside the Arctic Circle, but not considered part of the polar area?  I'm pretty bad at geography so I could be wrong.  But yeah, ice on land melting does mean a pretty straightforward ocean level raise, for sure.


#26    Frank Merton

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Posted 02 September 2013 - 10:02 PM

We can have an appreciable rise in sea levels even if the Greenland and Antarctic ice sheets don't melt.  They will still put out a lot of water and as the earth warms all ocean water will expand.


#27    spacecowboy342

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Posted 02 September 2013 - 10:05 PM

View Postcacoseraph, on 02 September 2013 - 09:59 PM, said:

I thought that was partly inside the Arctic Circle, but not considered part of the polar area?  I'm pretty bad at geography so I could be wrong.  But yeah, ice on land melting does mean a pretty straightforward ocean level raise, for sure.
Yeah you are right about Greenland not being considered part of arctic polar ice but still there is a lot of water locked up there


#28    Doug1o29

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Posted 03 September 2013 - 02:39 AM

View PostFrank Merton, on 01 September 2013 - 10:17 PM, said:

Is the ice a the poles salty or does the salt precipitate out during the freezing of the water?
The water freezes out of sea water.    It's called fractional crystallization.
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