| − | the extent of the sea-ice in the Atlantic sector of the Arctic sea have been shown to be correlated with the length of the sunspot cycle during the last 450 years. [http://www.tmgnow.com/repository/solar/lassen1.html]
| + | The extent of the [[sea ice]] in the Atlantic sector of the Arctic sea has been shown to be correlated with the length of the [[sunspot cycle]] during the last 450 years. [http://www.tmgnow.com/repository/solar/lassen1.html] |