31 Mar '15, 9pm

This quiz is as cold as ice. Test your knowledge on Earth's frozen poles: #ice #EarthRightNow h…

Sea ice is frozen sea water. It forms once the temperature of the water's surface drops below its freezing point. For salty ocean water, that's about 29°F (-2°C). (The salt impurities make the freezing point lower than that of pure water.) In contrast, icebergs, glaciers and ice shelves are made from freshwater, which comes from precipitation on land and other sources.

Full article: http://climate.nasa.gov/quizzes/frozen-poles/

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