The real reason for drawing the geology of the river is that it explains their curious course. In their beginnings, they are all mountain streams, such as exodus from the hills of rain everywhere. They are mixed in waterfalls, ripples in the pool. Their sides are steep, often quite close to be called gorges, the V-shape eroded by water flowing with a strong head of power through the ages for too long count. But when they reach the Causses, the character of the river suddenly changes. There are defects in the long volcanic gave them their bed of origin. The faults are not slopes, even steep, but cliffs where the rock has been split apart. At the bottom of the cliffs there is usually a screen slope caused by rockfalls, and below the bed is still covered by the flowing river.
Limestone is relatively soft and the beds rivers are worn as straight walls, so they are not actually false, which scour the water has dug. And the rivers bringing the right lime to the old bed of the rough seas. Once they are in limestone country, the river does not fall very quickly, they are quite sea level nearly all courses. Their throats are called "corridors", "passages" or, in the Tarn, "canyons."
The Causses have other effects on rivers perplexed. The rain falling on the plates did not form streams, it just sinks into the porous rock as if was blotting paper. Then he worked down, and accumulates in the caves and hollows with which the Causses are screened. Here and there it runs in underground rivers, at the hard core, until it finds an outlet. The bottom of the cliffs are pierced at intervals scheduled by powerful springs. Many of them, in the Tarn in particular, running in the beds of rivers themselves. These springs, which are called "Revivals" are very cold, pure and clear. These sources of fresh water are a resort upscale perfect for passengers Cruising around the world in search of a taste of the French countryside.
This has the surprising result that lower courses of rivers are clear that the upper waters, which are tinted with soil and debris all hill streams of color. Where the cliffs are removed from the bed rivers, as they are towards the west, the springs provide drinking water to the population. A good revival in this land of hot dry summers are a city. Perhaps the best example is the Chartreuse, the fountain of Cahors. At the time of Gaul, and during the Roman Empire, it was venerated as a goddess, so it might be, the crystal running cold outside of the burn, a limestone hill, and it is always done in the lot to provide drinking water to the city.
There is one thing to say against the Causse springs. The water was slowly seeping through the limestone, and it is difficult, while the water of rivers upstream is soft as silk. Same far west of the Causses, strictly speaking, where the low hills are covered with forests and fields, the field has this nature, porous absorbent. Then that between the rivers, it is singularly dry, and depends on rainfall rather doubtful for the maturation of crops. Indeed, the region whole, gives the impression of a barren land threaded with rivers.
But the rivers give a reason for living waters as veins of a leaf. The head springs are not far apart and they spread out to run in all the ancient valleys of what was the Aquitaine basin, and will meet again in the Atlantic, land Stomping typical global cruise ship luxury. No wonder the Romans when they conquered this land of streams, remembering their own precious, petty, Tiber, gave him the name of Acquitania the Land of Waters.
About the Author:
Sarah Martin is a freelance marketing writer based out of San Diego, CA. She specializes in travel, leisure, and luxury cruising. For amazing rates and discounts on
upscale around the world cruises
, please visit
http://www.amttravel.com
.
Article Source: ArticlesBase.com – The Geology of Rivers in France
Let The River Run – Carly Simon
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