Brine rejection is the expansion of water above freezing point.
When water begins to freeze, salt is excluded from the ice crystal and the process is known as brine rejection. after then the surrounding seawater becomes saltier and denser .This results in to the formation of fresh ice that floats on the dense water, creating a barrier between the ocean and the atmosphere.
Hence, Brine rejection is a process that occurs when salty water freezes. when salts do not fit in the crystal structure then it get expelled. Since the oceans are salty, this process is important in nature.
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