Sea ice is frozen ocean water.
It occurs in both the Arctic and Antarctic and can cover large extents of
It grows during the winter months and melts during the summer months, but some
sea ice remains all year in certain regions.
About 15 percent of the world's oceans are covered by sea ice during part of
The freezing temperature of salt water is lower than fresh water; ocean
temperatures must reach -1.8° C Celsius (28.8°F) to freeze.
Source: GreenFacts based on NSIDC
All about sea
Source: US Federal Government
Antarctic Photo Library
To read about this term in context:
GreenFacts Summary on Arctic Climate Change: