Water has high specific heat capacity 4200J/(Kg°C) so it can absorb large amount of heat without much rise in it's own temperature.
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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