This is the 13839th most frequent German word.
erstreckten
"Erstreckten" means "extended" or "stretched" in English, typically referring to something spanning or covering an area.
Here, 'erstreckten' is used to describe the physical extension or span of the mountains across a geographical area.
Die Berge erstreckten sich über viele Kilometer.
The mountains extended over many kilometers.
Here, 'erstreckte sich' is employed to indicate the temporal duration of an event.
Die Diskussion erstreckte sich über mehrere Stunden.
The discussion lasted for several hours.
In this context, 'erstreckte sich' indicates the range or extent of topics included in a curriculum.