surface of the globe for more than half is covered by salt water oceans and seas.People who live on the continents and islands, are used to their existence and economic activities of fresh water.And they take it out of rivers, lakes and other water bodies.If you bring the classic definition, the river - a stream of water, which is of natural origin and flows downward.Top of the source of the river is called, and the confluence of the other body of water - the mouth.In this context, there is a legitimate question: what is the delta?After all, this term is also referred to the confluence of the river to another body of water.
If you look at the world map or a globe, you can see that small rivers flow into lakes and large rivers.A major rivers carry their water in the seas and oceans.Depending on the characteristics of the landscape and the geological structure of the crust confluence of the river to the sea can take many forms.The most ordinary of its structure - it is a normal mouth.In this case, all boundaries of land and water bodies are clearly visible.When this limit is difficult to determine, it is clear that such a delta.First of all, it should be noted that this is a separate district with its landscape and geological structure.
At this point, from the mainstream branch off numerous branches.Since the force of the current is dramatically reduced, all cuttings, sludge and other solids precipitate.On the outside there is a contact area of sea and river water.As expressed by experts, the interaction of marine and continental environments.Fishermen on the Volga River is very well known that this delta.It formed a kind of habitat of flora and fauna.It differs from the conditions that have developed on the continent, and not like the sea abode.It is in these areas spawning fish sturgeon.
not only chooses the fish places to spawn.In such circumstances, lead an active life, many species of animals and, of course, people.Everyone knows that the Nile delta has become the cradle of many civilizations.Fundamentals of modern agriculture were laid in ancient Egypt.The river carried the life-giving water to many peoples who inhabited the surrounding area.Even in those times, people knew what the delta and what it means for the farmer.The most fertile soil accumulated here.Another thing is that cropping is always associated with a variety of risks - the water level will rise early, crocodiles brood.
should be noted that at the confluence of the sea delta formed by two mechanisms.In the first case, the river carries its waters a large amount of sediment, and gradually, they say, comes the sea.The edge of the coast moved inland water area.But it also happens that the strong current of the river washes the mouth of a deep channel.And then instead of alluvial soil foundation at this point is formed estuary.Lyman - a body of water in which the mixed river and sea water.An example of such an education can serve as the delta of the Dnieper.In such places very well spend the hot summer days, but no possibilities for agriculture nature does not provide.
