Annually, but the drainage from the eastern slopes of the Andes is large enough to meet the loss from evaporation and keep these inland lakes from drying up. At an early period this depressed area drained southward to the Colorado, and the bed of the old outlet can still be traced.
The sierra is the region of the Andes, and is about 250 m.
Of the Andes which is claimed by Bolivia, and the settlement of the dispute may materially diminish its size.
Flanking this great widening of the Andes on the south-east are the three short parallel ranges of Cordoba, belonging to another and older formation.
Towards the east they lie at a lower level; but in the Andes they reach a height of nearly 10,000 ft., and are strongly folded, showing that the elevation of the chain was not completed until after their deposition.
The marine facies of the later Tertiaries is confined to the neighbourhood of the coast, and was probably formed after the elevation of the Andes; but inland, freshwater deposits of this period are met with, especially in Patagonia.
During the Tertiary period the great volcanoes of the Andes were formed, and there were smaller eruptions in the Sierras.
Farther south, in Patagonia, the prevailing wind is westerly, in which case the Andes again " blanket " an extensive region and deprive it of rain, turning it into an arid desolate steppe.
From the mouth of the Colorado to the Andes, ranging from 57° to 55°; but the rainfall increases from 8 in.
The north wind usually terminates with a thunderstorm or with a pampero, a cold south-west wind from the Andes which blows with great violence, causes a fall in temperature of 15° to 20°, and is most frequent from June to November - the southern winter and spring.
The Antarctic beech and Winter's bark (Drimys Winteri) are found at intervals along the Andes to the northern limits of this zone.
On the lower slopes of the Andes are found oak, beech, cedar, Winter's bark, pine (Araucaria imbricata), laurel and calden (Prosopis algarobilla).
Of birds the number of species greatly exceeds that of the mammals, including the rhea of the pampas and condor of the Andes, and the tiny, brilliant-hued humming-birds of the tropical North.
Not only has scientific study advanced at the university of Buenos Aires, but scientific research is promoting the development of the country; examples are the geographical explorations of the Andean frontier, and especially of the Patagonian Andes, by Francisco P. Moreno.
This definition unfortunately ignored the fact that the Andes do not run from north to south in one continuous line, but are separated into cordilleras with valleys between them, and covering in their total breadth a considerable extent of country.
In the interior of South America the Spanish conquerors had explored the region of the Andes from the isthmus of Panama to Chile.
Pedro de Valdivia in 1540 made an expedition into the country of the Araucanian Indians of Chile, and was the first to explore the eastern base of the Andes in what is now Argentine Patagonia.
In 1541 Francisco de Orellana discovered the whole course of the Amazon from its source in the Andes to the Atlantic. A second voyage on the Amazon was made in 1561 by the mad pirate Lope de Aguirre; but it was not until 1639 that a full account was written of the great river by Father Cristoval de Acufia, who ascended it from its mouth and reached the city of Quito.
Lofty lines of fold mountains form the " backbones " of North America in the Rocky of Mountains and the west coast systems, of South America in the Cordillera of the Andes, of Europe in the Pyrenees, Alps, Carpathians and Caucasus, and of Asia in the mountains of Asia Minor, converging on the Pamirs and diverging thence in the Himalaya and the vast mountain systems of central and eastern Asia.
The last section through the Andes was finished in 1910.
Naturally the company named does not reach all of these points, but its line across the Andes supplies the indispensable link of communication, in the absence of which the east coast towns and the west coast towns have hitherto been as widely separated as if they had been located on different continents-indeed, far more widely separated in point of time and of freight charges than Great Britain and the United States.
Holoarctic types reappear on the Andes and in South Africa, and even in New Zealand.
The ship to which he was appointed was ordered to China, and he found opportunities during the voyage for indulging his passion for exploration, making a journey from Rio de Janeiro to the base of the Andes, and another from Bombay through India to Ceylon.
Sir Martin Conway's "Map of the Andes of La Paz" (1: 600,000; 'goo) as well as Major P. H.
This decline in its prosperity was checked, and the modern development of the port began, when a railway was built from Callao into the heart of the Andes, and Callao is now an important factor in the development of copper-mining.
America its natural occurrence appears to be limited to west of the Andes, but the tree is abundant in Mexico, Guatemala and Nicaragua.
America down to the slopes of Chimborazo; the Cordilleras of the Andes separating the Castilloas from the Heveas of Brazil.
There are winter winds from the Andes, but in the summer season there are cold currents of air from up-river (ventos da cima) which are usually followed by downpours of rain.
The tapir also has an extensive range between the coast and the foothills of the Andes, and from northern Argentina to south-eastern Colombia.
The latter region is densely forested from the Atlantic to the Andes, but with a varying width of about 200 m.
A' branch of the eastern chain of the Andes enters Venezuela in the west about 7° N.
Half of these have their origin in the summits of the Andes, and run with a permanent supply of water into the ocean.
The absence of rain here is ascribed to the action of the lofty uplands of the Andes on the trade-wind, and to the influence of the cold Humboldt current sweeping northward along the west coast of the continent.
When the wind rises above the snow-capped Andes, the last particle of moisture is wrung from it that a very low temperature can extract.
At the time when it is hottest and driest on the coast it is raining heavily in the Andes, and the rivers are full.
Above the sea, and has a length of 180 m., is remarkable for its long course between the outer and central ranges of the Andes, in a trough known as the " Callejon de Huaylas," 100 m.
Those of Carabayllo and Rimac are connected, and the view from the Bay of Callao extends over a vast expanse of fertile plain bounded by the Andes, with the white towers of Lima in a setting of verdure.
The region of the Cordilleras of the Andes is divided into Puna, or lofty uninhabited wilderness, and sierra, or inhabitable moun- Sierra.
Paz Soldan and other Peruvian geographers give the name of Andes, par excellence, to the Eastern Cordillera.
In most parts ofithe Peruvian Andes the line of perpetual snow is at 16,400 ft.; but on the Cordillera Nevada, above the Callejon de Huaylas, it sinks to 15,400 ft.
The central chain is connected with the Eastern Andes by the transverse mountain-knot of Vilcanota, the peak of that name being 17,651 ft.
The central chain continues to run parallel with the Maritime Cordillera until, at Cerro Pasco, another transverse knot connects it with the Andes in to° 30' S.