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Sea Floor Spreading: As the magma cools, new crust is created and becomes part of the moving plates. This is the phenomenon of sea Floor spreading-floor spreading. Spreading rates, though slow, are not negligible. The Atlantic is opening up by 2cm (0.75in) a year. The fastest rate is found at the East Pacific Rise, which creates 10cm (4in) of new crust every year - that is 1,000km (620 miles) in the short geological time of ten million years.
By 1966 the hypothesis of sea Floor spreading-floor spreading had been further established by independent oceanographic data involving microfossils, sediment thickness (thicker on older crust where sediments had more time to accumulate), measures of heat flow from the earth's interior, and palaeomagnetic and seismological studies. The expression "global tectonics" came into use in 1968, to explain the links between spreading ridges, transform faults, sinking trenches, drifting continents and mountain-building. This new theory is undoubtedly the most significant put forward in earth sciences this century.See Also Florida Deep Sea Fishing:Fishing has, of late years, become highly popular in the rivers of the north and northwest, and florida deep sea fishing-sea fishing flourishes along the Mediterranean coast, while night fishing, by flares, is being taken up in a big way along Catalonia's Costa Brava.
9. Spas and Health Resorts La Toja, near Vigo, is by far the most luxurious and widely known spa of Spain. La Toja's big, modern Hotel Mneario is a place of social elegance, where evening dress is generally worn at dinner. The whole wooded island on which it stands is a sport center (swimming, fishing, sailing, tennis, etc.) quite rivaling in appeal the "call of the waters" which help to cure arthritis and rheumatism.
Game fishing (fishing for trout and salmon) and coarse fishing (angling for other freshwater fish) are becoming increasingly popular. Game fish tend to be scarcer and therefore game fishing is more expensive than coarse fishing which is usually obtainable in most local rivers, lakes and canals. Often coarse fish (which are not always easy to cook or good to eat) are returned to the water after being caught and (in competitions) weighed, while the trout and salmon caught by the game fishermen are delicious to eat. Freshwater salmon can grow as heavy as 16kg (40lb) or more in European rivers.
On The Other Hand See Sea Pollution:Most forms of air sea pollution have arisen from the activities of industrial man and many are readily curable. Legislation in the wealthier industrial countries has been effective in reducing smoke and smog sea pollution, keeping airborne effluent from factory chimneys under control and generally improving the quality of the atmosphere. New factories are better equipped to reduce sea pollution and ways are being sought to keep down the pollutants from motor car and aircraft engines.
These remedies are costly; industrial man finds that he has to pay more to maintain and improve his standard of living. The developing countries, now on the brink of industrialization, still have the problem of air sea pollution in front of them.
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