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That would depend on what you consider "cool" to be. The world has been cooling almost since it first formed and it is still cooling today. So, there is really no answer to your question, unless you want to restate it to something like "how long did it take for the earth to cool to its current temperatures?". In that case, the answer would be the same as the age of the earth, or between 4 and 5 billion years.
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∙ 13y ago
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When was The Long Earth created?
The Long Earth was created in 2012.
When was Long Cool Woman in a Black Dress created?
Long Cool Woman in a Black Dress was created in 1972-04.
Does it take a short time or long time for the earth cool?
It takes a long time
Does it take a short time or long time for the earth to cool?
It takes a long time
Does it take a short time or a long time for earth to cool?
It takes a long time
When was The Long Fall Back to Earth created?
The Long Fall Back to Earth was created on 2009-04-21.
Does it take a short time or a long time for the earth to cool?
The Earth formed 4.6bn years ago, and the temperature of the core is currently 5200°c, and it's projected to go cold in something like 90bn years time, which is irrelevant as the Sun will turn into a Red Giant in around 5bn years time, engulfing the Earth and completely destroying it, so to answer your question, it takes a VERY long time for the Earth to cool down- so long in fact, that it will actually NEVER cool down.
Was nasas cool suit changed when it was adapted for use on earth?
Short answer: No. Long answer: No it was not.
How long should pies cool prior to being box?
0minutes
How long should pies be cool prior to being boxed?
0minutes
Did scientists create the Earth?
No, but some scientists do study how the earth, the solar system and the universe came to be based on observations of the universe today and in the past and our understanding of the "laws of physics."
Why do the earliest rock samples date from 800 million years after Earth formed?
IT took the earth this long to cool enough to form rocks
