Coral reef A fringing reef forms around an extinct volcanic island as the island and ocean floor subsides. As the subsidence continues, the fringing reef becomes a barrier reef and ultimately an atoll reef. Darwin predicted that underneath each lagoon would be a bedrock base, the remains of the original volcano. Subsequent research supported this hypothesis. Darwin's theory followed from his understanding that coral polyps thrive in the tropics where the water is agitated, but can only live within a limited depth range, starting just below low tide. Where the level of the underlying earth allows, the corals grow around the coast
Lymington Open Air Sea Water Baths Lymington Open Air Sea Water Baths The Lymington Open Air Sea Water Baths (or "historic Roman Seawater Baths") is a lifeguarded open air lido in Lymington, Hampshire, England. Built in 1833, it is the oldest lido in the United Kingdom, and at 110 metres long by 50 metres wide it is also one of the largest in area. The baths reopened in 2010 following a campaign by local people who also completed the baths' refurbishment. The pool uses filtered and chlorinated seawater. Owned and managed by Lymington and Pennington Town Council, the opening season is normally from May to September.