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Between 1984 and 2016, both the total area covered by sea ice and the portion of sea ice that was more than a year old decreased significantly. Explore the sea ice in September, when it covers the least amount of area.
explain it

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Answer:

Years 2005-2009 are light purple, the record-low year 2012 is ... Minimum sea ice extent has decreased 13.1% per decade since 1979. ... In the Arctic Ocean, the area covered by sea ice grows and shrinks ... Less than 1% of ice is 4 or more years old. ... Arctic sea ice minimum as of September 10, 2016.

Explanation: