What explains the unchanging language of Iceland?

The geographical isolation of the country.

Explanation:

Language on Iceland hasn't changed much since 1300s. The reason is simple. Iceland is located in the far northwest of Europe, not being connected with the rest of the continent. Therefore, it is practically impossible to discuss about any changes in culture, language, customs... during a long period of time. This isolationism formed a specific culture.

landlessness of ordinary people

^^something like that^^^

answertemperature;