There are many ways that pollution can damage reefs. Debris like this plastic bag can quickly become entangled on a coral and smother it.
NOAA 2016 tide tables are now available. NOAA tide tables have been in production for 150 years and are used by both commercial and recreational mariners for safe navigation.
NOAA's National Ocean Service
N/MB6, SSMC4, Room 9149
1305 East-West Hwy
Silver Spring, MD 20910
Revised: June 22, 2015 | You are here: http://oceanservice.noaa.gov/education/tutorial_corals/media/supp_coral09b.html