pl23_expn4557.jpg
![What are the brown patches on this rock surface? expn4557.jpg What are the brown patches on this rock surface?](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expn4557.jpg)
Description
What are the brown patches on this rock surface?
Credit
NOAA Office of Ocean Exploration and Research, 2015 Hohonu Moana
Display Date
20150812T202650Z
Location
Hawaii, Bank 9 North
Collection
Voyage to Inner Space
Ocean Exploration Collection
Modern Expeditions
2015 Hohonu Moana