Our amazing planet.

Bahamas from Above: Brilliant Blues and Sandy Shores

News
By published
tidal-flats-110104-02
Tidal flats and channels, Long Island, Bahamas. (Image credit: NASA.)

The islands of the Bahamas are situated on large depositional platforms the Great and Little Bahama Banks composed mainly of carbonate sediments ringed by reefs. The islands are the only parts of the platform currently exposed above sea level.

The sediments were formed mostly from the skeletal remains of organisms settling to the sea floor; over geologic time, these sediments consolidated to form carbonate sedimentary rocks such as limestone.

To the north of Sandy Cay, an off-white tidal flat composed of carbonate sediments is visible; light blue-green regions indicate shallow water on the tidal flat. The tidal flow of seawater is concentrated through gaps in the land surface, leading to the formation of relatively deep channels that cut into the sediments. The channels and areas to the south of the island have a vivid blue color that indicates deeper water.

Live Science Staff
Live Science Staff
For the science geek in everyone, Live Science offers a fascinating window into the natural and technological world, delivering comprehensive and compelling news and analysis on everything from dinosaur discoveries, archaeological finds and amazing animals to health, innovation and wearable technology. We aim to empower and inspire our readers with the tools needed to understand the world and appreciate its everyday awe.