heimildaskrá
http://thekingstwo.shawwebspace.ca/photos/view/unique_plant_growth
http://www.publicdomainpictures.net/view-image.php?image=23746&picture=water-running-downstream
http://www.mr.is/~gk/jfr/ordskyr/h/mulningur_sandkorna.htm
http://www.visindavefur.is/svar.php?id=61289
Um víða veröld Jörðin
http://www.publicdomainpictures.net/view-image.php?image=23746&picture=water-running-downstream
http://www.mr.is/~gk/jfr/ordskyr/h/mulningur_sandkorna.htm
http://www.visindavefur.is/svar.php?id=61289
Um víða veröld Jörðin