How to use River-basins in a sentence
But there are several points at which its division from other river basins is only marked by a very low parting.
These chapadas and elevations, which are usually described as mountain ranges, are capped by horizontal strata of sandstone and show the original surface, which has been worn away by the rivers, leaving here and there broad flat-topped ridges between river basins and narrower ranges of hills between river courses.
Add to these the eroded river basins of the Xingu, Tapajos and Guapore on the north and west, the Paraguay on the south-west, and the scores of smaller rivers along the Atlantic coast, and we may have some conception of the agencies that have been at work in breaking down and shaping this great table-land, perhaps the oldest part of the continent.
It includes the river basins of the Tocantins-Araguaya, Xingu, Tapajos, and the eastern tributaries of the Guapore-Madeira.
There are four separate river basins in the Transvaal.Advertisement
In the broad river basins the inundations deposit annually a fresh top-dressing of silt, thus superseding the necessity of manures.
Of the three great river basins of Ionia and Lydia, those of the Hermus, Cayster and Maeander, it commanded the second, and had already access by easy passes to the other two.
The first cotton mill was built at Brunswick on the Androscoggin about 1809, and from 1830 the development of cotton manufacturing was rapid; woollen mills followed, and late in the 19th century were erected some of the largest paper and pulp mills in the country, which are run by water power from the rivers, and use the spruce and poplar timber in the river basins.
A small part of the northern Colombia, on the lower courses of the Atrato and Magdalena, extending across the country from the Eastern to the Western Cordilleras with a varying width of 100 to 150 m., not including the lower river basins which penetrate much farther inland, also consists of low, alluvial plains, partly covered with swamps and intricate watercourses, densely overgrown with vegetation, but in places admirably adapted to different kinds of tropical agriculture.
On the more level areas of the Piedmont Plateau the granitic soil is a grey mixture of sand and clay, but on the hillsides of the river basins it is a heavy clay of reddish colour, the sand having been washed down to form the soils of the Coastal Plain.Advertisement
These four river-basins occupy the greater part of the lower plateaus of North and West Africa, the remainder consisting of arid regions watered only by intermittent streams which do not reach the sea.
Naturally there are no great river-basins or extensive plains, but one of the features of the island is the frequent occurrence, not only along the coasts, but at various heights inland, of beautiful stretches of level ground often covered with the richest pastures.