Susan Swensen
Puamakanui
Secchi Disk
Marine disks are plain white; freshwater disks usually have black patterns. We were able to see the disk in 40 feet of water.
193
views
0
faves
0
comments
Uploaded on January 11, 2011
Taken on January 6, 2011
Secchi Disk
Marine disks are plain white; freshwater disks usually have black patterns. We were able to see the disk in 40 feet of water.
193
views
0
faves
0
comments
Uploaded on January 11, 2011
Taken on January 6, 2011