https://quizlet.com/94639282/jardfraedi-bergtegundir-flash-cards/
https://quizlet.com/106920985/bergtegundir-flash-cards/
https://is.wikipedia.org/wiki/Storkuberg
http://www.ni.is/jord/berggrunnur/berg
http://www.namur.is/jardmyndanir-og-landslag/grunnur-lands/
https://www.visindavefur.is/svar.php?id=61334
Um víða veröld jörðin
Jarðfræði eftir Þorleif Einarsson