Water is such a compound that can change its state at any temperature and pressure without changing its chemical properties. It is also called the universal solvent. It can solve anything with its solubility power. The earth is made by 2/3 part of water and 1 part is land. In those 2 parts, the land containing water is divided into 7 oceans. Due to large amount of contained water, those parts covered by water are called oceans and seas.
The water of those seas is different from the water we use daily. Because of the cold blooded aquatic animals inside the water, the water of sea contains huge amount of salt. According to the chemical property of water, it freezes at 0°C and boils at 100°C. But due to presence of salt, the freezing point of water decreases. Therefore, the water of sea does not freezes at the winter season too.
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