It is thought by some that the channels in the Black Sea were formed around 6, 000 years ago when sea levels were approaching their current point.

Cross-section of the Irish Sea through Man, showing sea levels.

Sea levels began to rise during the Jurassic, which was probably caused by an increase in seafloor spreading.

Sea levels fell, exposing land bridges between Africa and Eurasia and between Eurasia and North America.

During this period the southern Red Sea ’ s levels dropped and was only 2. 5 miles or 4 km wide.

Sea levels had dropped coincident with the ice age, but slowly recovered over the course of the Silurian and Devonian.

This provided less natural dilution of Mediterranean salinity and ended the higher levels of natural turbidity, additionally making conditions more like those in the Red Sea.

Environment-current issues: inadequate sanitation facilities ; increasing levels of soil salinity ; industrial pollution ; excessive pesticides ; part of the basin of the shrinking Aral Sea suffers from severe overutilization of available water for irrigation and associated pollution

In 2003, ICES stated there is a high risk of stock collapse if then current exploitation levels continued, and recommended a moratorium on catching Atlantic cod in the North Sea during 2004.

Sea levels have been lower and higher than at present, resulting in significant changes to the coastline during this period.

Sea levels rise abruptly and massive inland flooding occurs due to glacier melt.

Water consumption is so high that groundwater levels in the Sanaa basin are diminishing ; because of this, government officials have proposed relocating large portions of the population of Sana ' a to the coast of the Red Sea.

Opposition came from fishermen along the Zuiderzee who would lose their livelihood, and from others in coastal areas along the more northerly Wadden Sea who feared higher water levels as a result of the closure, and others who doubted whether it was financially practical.

The main dungeon in Slash ' EM is much larger than in NetHack, introducing special levels such as the Sunless Sea, where a magic lamp lies, and the Guild of Disgruntled Adventurers, populated by " player monsters " ( archaeologists, barbarians, and the like ).

A Thames Barrier flood defence closure is triggered when a combination of high tides forecast in the North Sea and high river flows at the tidal limit at Teddington weir indicate that water levels would exceed in central London.

Bombay Beach is located on the east shore of the Salton Sea and, like many communities along its shores, has had to contend with rising and falling water levels.

Throughout the 1980s and 1990s, as salinity and suspected pollution levels in the Salton Sea increased, the attraction of the Salton Sea as a recreational destination diminished.

Water levels rose and the western Tethys came to shallowly cover significant portions of Europe, forming the ( first ) Tethys Sea.

Whilst the lower reaches of the River Havel provide the most direct route to Hamburg and the North Sea ports, variable water levels in the River Elbe affect those in the lower River Havel, and together these can restrict navigation.

The current channel of the Great Belt was created by a relatively high fresh water phase of the rising Yoldia Sea breaking through to the lower Kattegat levels at about 10, 000 BP.

At the end of that time rising Kattegat levels broke into the Ancylus lake, creating the Littorina Sea.

The " Century Flood " of 1976 and the " North Frisian Flood " of 1981 brought the highest water levels measured to date on the North Sea coast, but because of sea defences such as improved warning systems and dikes built and modified after the flood of 1962, these led only to property damage.

Sea level rise may also contribute to accretion, as material is pushed up with rising sea levels.

At the close of the Permian, lycopod and equicete swamps reminiscent of Carboniferous flora were relegated to a series of equatorial islands in the Paleotethys Sea that later would become South China.

The magmatic rocks of the Permian ( c. 250 Ma ) Oslo Graben formed in a failed rift system that continues into the Skagerrak and the North Sea.

In later Permian time, the Toroweap Basin was invaded by the warm, shallow edge of the vast Panthalassa ocean in what local geologists call the Kaibab Sea.

The Sylva River flows leisurely over a flat plateau, across Preduraliye Nature Preserve, and past abrupt cliffs, fossilized remnants of coral reefs left by the long-disappeared Great Permian Sea, which at some places rise up to 100 metres above the level of the river, covered with pine and fir groves.

Later in Permian time, the Kaibab Sea invaded the land and laid down a limey ooze that later lithified to form the locally 0 to 200 foot ( 60 m ) thick Kaibab Limestone.

Retreat of the Kaibab Sea by the Mid Permian exposed its seabed to erosion, resulting in 100 foot ( 30 m ) deep channels and the creation of a gap in the geologic record called an unconformity.

Sea level dropped as the late Permian glaciation intensified and locked increasing amounts of water in distant ice caps.

Albania was admitted on 22 February 1949, to the Comecon and Albania remained important both as a way to put pressure on Yugoslavia and also to serve as a pro-Soviet force in the Adriatic Sea.

The Syrians remained in control of a strip of territory along the Sea of Galilee originally allocated to the Jewish state, the Lebanese occupied a tiny area at Rosh Hanikra and the Egyptians retained the Gaza strip and still had some forces surrounded inside Israeli territory.

At the same time, with the aid of numerous merchant ships converted to auxiliary cruisers, a loose naval blockade on the Ottoman coasts from the Dardanelles to Suez was instituted, which disrupted the Ottomans ' flow of supplies ( only the Black Sea routes to Romania remained open ) and left some 250, 000 Ottoman troops immobilized in Asia.

However, after the Hanseatic League was de facto disbanded in 1669, Lübeck still remained an important trading town on the Baltic Sea.

No written record has remained from the era before the Persian Empire, but in the oral history and culture, the Iranians have called the southern waters: " Jam Sea ", " Iran Sea ", and " Pars Sea ".

While Vietnam has remained relatively conflict-free since its Cambodia days, tensions have arisen in the past between Vietnam and its neighbors, especially in the case of China since both nations assert claims to the Spratly Islands, an archipelago in a potentially oil-rich area of the South China Sea.

Except for the Black Sea shore in the south, Bessarabia remained outside direct Roman control ; the myriad of tribes there are called by modern historians Free Dacians.

After the Z Plan was completed in the mid-1940s, Raeder's plans called for a " double pole strategy ", in which U-boats, Panzerschiffe and cruisers operating alone or in tandem would attack British commerce all over the globe, forcing the Royal Navy to divert ships all over the world to deal with these threats while at the same time two task forces of carriers, battleships, cruisers and destroyers would engage in frequent sorties into the North Sea, preferably from bases in Norway to destroy what remained of the British Home Fleet in a series of battles that would give Germany command of the sea.

The size of this inland sea remained largely stable from the 15th century onwards due to improvements in dikes, but when storms pushed North Sea water into the inlet, the Zuiderzee became a volatile cauldron of water, frequently resulting in flooding and the loss of ships.

The Sword Blade Company remained bankers to the South Sea, and indeed had flourished despite the companies doubtful legal position.

Blunt remained a South Sea director, as did Sawbridge and they had been joined by Gibbon and Child.

Territorial disagreements along the border and in the South China Sea that had remained dormant during the Vietnam War were revived at the war's end, and a postwar campaign engineered by Hanoi against the ethnic Chinese Hoa community elicited a strong protest from Beijing.

The old gas fixtures even remained under pressure until the installation of North Sea gas in the early 70's.

It was believed at this time that Southern European and Eastern European peoples were racially mixed with non-European Moors from across the Mediterranean Sea, while Northern Europeans and Western Europeans remained pure.

The Queen, though, insisted that her son be allowed to remain with his ship, meaning Prince Andrew remained on board Invincible to serve as a Sea King helicopter co-pilot, flying on missions that included anti-submarine warfare and anti-surface warfare, Exocet missile decoy, casualty evacuation, transport, and search and air rescue.

The Sarmatians remained dominant until the Gothic ascendancy in the Black Sea area.

The Iazyges remained nomads, herding their cattle across what is now southern Romania every summer to water them along the Black Sea ; a Roman conquest of Dacia would cut that route.

In June 1744, following the Lopukhina Affair, they transferred him to Kholmogory on the White Sea, where Ivan, isolated from his family, and seeing no one other than his gaoler ( jailer ), remained for the next twelve years.

But they were ferried across the Great Sea on Tol Eressëa while the Teleri yet searched for their lord, for Thingol was lost in Nan Elmoth, and when Ulmo returned for them, a part of that people remained behind, and the Sea filled them with sorrow.

Only two games ever remained tied after overtime in WLAF / NFL Europa history: London Monarchs versus Birmingham Fire in Week 4 of the 1992 season, and Berlin Thunder at Hamburg Sea Devils, on 1 April 2006.

The Ottoman supremacy in large-scale fleet battles in the Mediterranean Sea remained unchallenged until the Battle of Lepanto in 1571.