The immeasurable diversity of nature on our planet: scientists consider to 3500 species of mammals and more than 850 000 species of insects. Despite the fact that already for many centuries is explored flora and fauna, and annually published reports of discoveries of new species, which find even in long inhabited and explored areas. So, in the early 30-ies of our century was known to 800 thousand species of butterflies, and by 1942 he already 900 thousand species. Even less studied is the life in the oceans, which often make sensational discoveries.
The existence in the seas and oceans are dangerous animals the people knew even in ancient times, although along with very real views were widespread tales of fantastic sea monsters. It was known about the danger of injections of some animals, on the toxicity of some marine animals by eating them for food and, of course, about large aggressive fish – the shark. Currently published a lot of papers devoted to the description of poisoning from the ingestion of marine animals in different parts of the World ocean. So, only in 50-ies of our century from such poisoning suffered tysjacheletij. According to the researchers, only poisonous fish there are about 500 species, most of which live in the salty waters.
By climatic and geographical basis distinguish polar, Northern, temperate, subtropical and tropical zones. The majority of our population lives in Northern and moderate climatic zones and therefore are not familiar with the fauna and flora of the tropics. Year-round abundance of warmth in them contributes to the rapid development of wildlife. So, in the Amazon region, has about 15 thousand different species of animals. Continue reading
In ancient times, 65 million years ago (the end of the age of dinosaurs), on the border between the Cretaceous and Paleogene periods, lapped the ancient Tethys ocean . which, in geologically near future had to disappear and leave behind the Mediterranean . The black and Caspian seas and the Persian Gulf. The first two are further connected by the Atlantic ocean, the latest from the Indian.
Page sections about geologic processes in the Atlantic ocean and the seas of the Atlantic .
Sea Atlantic area
Archipelagos and underwater ridges of the Atlantic
The formation of the Strait of Gibraltar and the Mediterranean sea (5 million years BP)
The Strait of Gibraltar that separates Morocco from Spain, is only 15 km width. Perhaps the flooding of the plains by the ocean between Africa and Europe and is reflected in the ancient Greek myth of Debelyanovo the flood that supposedly happened in “ancient Greece”*, namely in the district of Dodon and of the river of Aheloy [I think it was near the Caucasus, and then we can talk about the Black sea]. There is another myth, that the rocks of Gibraltar and Ceuta opened Hercules.
The breakthrough of the Ocean through the Gibraltar – perhaps the work of man.
Kondratov A. Atlantis Tethys sea. Exposure.
Leonardo da Vinci on the levels and currents of the seas. Continue reading
The black sea is very suitable for kids: summer storm rare here – because the Black sea is small, the wind is harder to rock the waves ; W here there is almost no dangerous sea animals, and in water less salt, and it doesn’t sting the eyes. Here is to learning how to dive, first to get acquainted with the underwater world.
The black sea is surrounded by land, but it’s not the lake – the Bosporus and the Dardanelles coedine added it to the Mediterranean sea.
The Black sea flows into many rivers, so the salinity of its surface waters is low: 17 ‰ – grams of salt in a liter of water. Due to the low salinity reduced the biodiversity of the Black sea: the inhabitants of the seas and oceans can not tolerate salinity below 20 ‰.
Surface water of the Black sea is less salty and lighter, similar in temperature to the air ; in the summer it warms up. in winter it is cooled. It is familiar to us Black sea: in it, we swim and dive, catch fish.
C ovsem other – deep waters of the Black sea: from 50-100m – to the bottom, lying at a depth of two kilometers is more salty and heavy. their temperature is always constant and: o S. 9 – properties of the waters of the Black sea
Desalinated surface water is almost not mixed with the more saline deep waters: it prevents the penetration of oxygen into the depths of the Black sea. Deeper than 200 meters – the oxygen in the water of the Black sea is missing, the plants and animals there can not live, but live bacteria that break down down the remains of life and produce the hydrogen sulfide. Continue reading