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Sea ice is frozen seawater. It floats on the ocean. It forms in both the Arctic and the Antarctic each winter. The Arctic is a continent in the North Pole. The Antarctic is a continent in the South Pole. Sea ice shrinks in summer but does not completely disappear.

Two characteristics of climate change are resulting in sea level rise. First, the melting of ice sheets and glaciers on land are adding more water to the oceans.

Learn more about the different causes of sea level change and the scientific background of observations and projecting sea level. Find out about the history of measuring sea level and how state-of-the-art physical climate models predict sea level change into the future.