(28) Erik Ong.. CC-BY-SA.
(29) Erik Ong.. CC-BY-SA.
(30) http://en.wikipedia.org/wiki/ROV. GNU-FDL.
(31) http://en.wikipedia.org/wiki/Image:Bay_of_Fundy_Low_Tide.jpg.
GNU-FDL.
(32) USGS.http://pubs.usgs.gov/of/2000/of00-006/images/nod_r.gif. Public
Domain.
(33) http://en.wikipedia.org/wiki/File:Coral_reefs_in_papua_new_guinea.JPG.
GNU-FDL.
(34) http://en.wikipedia.org/wiki/Image:Boelge_stor.jpg. GNU-FDL.
(35) Erik Ong.[CC-BY-SA ]. GNU-FDL.