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Sea ice covers several million square miles of Earth’s surface. Because salt is expelled during the freezing process, this ice is fresher than the seawater from which it forms. Most sea ice is pack ice that drifts across the ocean surface, but some, known as fast ice, is attached to coasts, the seafloor, or grounded icebergs. Factors like the age of the sea ice, air temperatures, and solar insolation all affect its freezing and melting. Why does first-year ice melt more easily than older ice? Discuss
Source: The Free Dictionary