Why is it good that ice floats and doesn't sink?

Answer

It is good that ice floats on water because plants and fish can survive in water that is covered by the floating ice sheet. Water in its solid state becomes less dense than in its liquid state, unlike other matter types, due to its hydrogen bonding.

In the winter, the air gets cooler initially, then the lake water gradually cools from top to bottom. When the lake water reaches 4 degrees Celsius, it attains maximum density. When the temperature of the top of the lake starts falling below 4 C, it turns into ice that floats and serves as an insulator for the water underneath. As the water underneath remains at 4 C at maximum density, it becomes congenial for the survival of the organisms.

Q&A Related to "Why is it good that ice floats and doesn't sink..."
If ice sank there would be far less land on which to live. which would be bad. I would also not get the instant hit of cool refreshment in my warm summer beverage. that's why it is
http://wiki.answers.com/Q/Why_is_it_good_that_ice_...
Ice floats because it is less dense than liquid water. Ice is about 9% less
http://www.chacha.com/question/how-does-ice-float-...
The first motorized submarine was built by John Holland, and it became the U.S. Navy's first commissioned sub in 1900. Dubbed the USS Holland, it had two motors: a gasoline engine
http://www.ehow.com/about_6457164_submarine-floats...
To follow the answer of Oday Nasser: Ice is less dense than water because of its intermolecular forces. Water contains hydrogen bonds (a type of intermolecular force of attraction
http://www.quora.com/Why-does-ice-float
Explore this Topic
No, ice cannot sink in water. Ice is less dense than water, or even soda, so it will always float. However, in a substance like ethyl alcohol the ice will sink. ...
Even though ice is water in a solidified state, it is significantly less dense than water. This is evident in how ice floats on water instead of sinking to the ...
Density is the factor that decides whether an object will sink or float. If an object is more dense than the medium is it placed in, it will sink. If an object ...
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