Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ...of that region. As all the streams of a river-basin fall to the lower level of that basin, so several river-basins may descend to the still broader basin of some sea or ocean, and all such basins discharging themselves into the same sea constitute a river-system. The river-systems are necessarily named after the great oceans into which they flow; and thus we have the Arctic, the Atlantic, Pacific, and Indian systems, together with a few inland systems whose streams flow towards certain depressed areas altogether cut off from connection with the ocean. These are the Aralo-Caspian basin, the Utah, the Mexican, the Bolivian, &c., whose waters flow inwards to certain lakes, and are thence carried off by evaporation. Where the slopes of a country are pretty uniform, the surface waters are at once carried off by streams and rivers; but where any unusual depression occurs, there they accumulate and form lakes and morasses. Most of these lakes both receive and discharge running water; but some of a small size, being fed by springs and reduced by evaporation, neither receive nor discharge running water; while others again receive streams and rivers, but have no outlet--their surplus waters being carried off by evaporation. The former set of lakes are always fresh; the latter, like the Caspian, Aral, and Dead Sea, always less or more brackish and saline. The following table exhibits the salinity of several of these lakes as compared with that of the Mediterranean:--The student who desires more minute details on this portion of his subject will find ample data as to lengths and developments of rivers in the ' Royal Physical Atlas' of A. K. Johnston; as to towns and populations which their waters have attracted to their banks, in the 'Manual of Modern Geography' of...
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Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ...of that region. As all the streams of a river-basin fall to the lower level of that basin, so several river-basins may descend to the still broader basin of some sea or ocean, and all such basins discharging themselves into the same sea constitute a river-system. The river-systems are necessarily named after the great oceans into which they flow; and thus we have the Arctic, the Atlantic, Pacific, and Indian systems, together with a few inland systems whose streams flow towards certain depressed areas altogether cut off from connection with the ocean. These are the Aralo-Caspian basin, the Utah, the Mexican, the Bolivian, &c., whose waters flow inwards to certain lakes, and are thence carried off by evaporation. Where the slopes of a country are pretty uniform, the surface waters are at once carried off by streams and rivers; but where any unusual depression occurs, there they accumulate and form lakes and morasses. Most of these lakes both receive and discharge running water; but some of a small size, being fed by springs and reduced by evaporation, neither receive nor discharge running water; while others again receive streams and rivers, but have no outlet--their surplus waters being carried off by evaporation. The former set of lakes are always fresh; the latter, like the Caspian, Aral, and Dead Sea, always less or more brackish and saline. The following table exhibits the salinity of several of these lakes as compared with that of the Mediterranean:--The student who desires more minute details on this portion of his subject will find ample data as to lengths and developments of rivers in the ' Royal Physical Atlas' of A. K. Johnston; as to towns and populations which their waters have attracted to their banks, in the 'Manual of Modern Geography' of...
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