No, but it can stay a liquid past 32F, without salt. In some glaciers, spelunkers and scientist have seen or observed "super-cooled water" water that is under so much pressure that it moves around too quickly to form ice. The scientists theorize that it explains why some glaciers, even in sub-artic zones appear to melt or shear off to form icebergs.
Water, like any form of matter, obeys the laws of gravity, so when you put water in a zip-lock bag it forms a tear drop shape, rather than a pillow shape like gasses. Or when you stackboxes full of stuff, the bottom ones get crushed, the middle ones bow out and the top ones retain thier original shape. Ice, water, and steam are the same way, how it was explained to me, oceans are like a "bell curve" when it comes to temperature. The surface 15% is the warmest, the middle 80% is the coolest, but the bottom 5% is warmer than the middle, but not as warm as the top, due to pressure and proximity to the earths core.
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