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Updated: June 25, 2025
He who should study the monuments of the natural world under the influence of a similar infatuation, must draw a no less exaggerated picture of the energy and violence of causes, and must experience the same insurmountable difficulty in reconciling the former and present state of nature, If we could behold in one view all the volcanic cones thrown up in Iceland, Italy, Sicily, and other parts of Europe, during the last five thousand years, and could see the lavas which have flowed during the same period; the dislocations, subsidences, and elevations caused during earthquakes; the lands added to various deltas, or devoured by the sea, together with the effects of devastation by floods, and imagine that all these events had happened in one year, we must form most exalted ideas of the activity of the agents, and the suddenness of the revolutions.
By the evaporation of sea water the soil is thus left so salty that no vegetation can grow upon it, and in places beds of salt several feet in thickness have accumulated. Under like conditions salt beds of great thickness have been formed in the past and are now found buried among the deposits of ancient deltas. SUBSIDENCE OF GREAT DELTAS. As a rule great deltas are slowly sinking.
In order to account for this phenomenon, the geologist has only to examine the small deltas of torrents which enter the Swiss lakes when the waters are low, such as the newly-formed plain where the Kander enters the Lake of Thun.
By the time that large areas had been raised above the ocean, we may fairly suppose a luxuriant vegetation to have been acquired. Under what circumstances are we likely to find this vegetation fossilized? Large surfaces of land imply large rivers with their accompanying deltas; and are liable to have lakes and swamps.
They were now approaching the mighty Amazon, and the river upon which they had hitherto been travelling appeared to divide into many branches, where it formed deltas with the Amazon.
"Wonder if I ought to take any notice of it officially," said Abanazar, who had just remembered he was a prefect. "It's none of your business, Pussy. Besides, if you did, we'd have them hostile to us; and we shouldn't be able to do any work," said Aladdin. "They've begun already." Now that West-African war-drum had been made to signal across estuaries and deltas.
Give the erosion history of the region by cycles, beginning with the oldest, the work done in each and the work left undone, what brought each cycle to a close, and how long relatively it continued. The characteristic features of river deposits and the forms which they assume may be treated under three heads: valley deposits, basin deposits, and deltas.
When the volcanoes have done spouting, and the earthquakes are quaked out, and you can tell what land is going to be solid and keep its level twenty-four hours, and the swamps are filled up, and the deltas of the great rivers, like the Mississippi and the Nile, become terra firma, and men stop killing their fellows in order to get their land and other property, then perhaps there will be a world that an angel would n't weep over.
Nations that faltered, that waxed prosperous in fat valleys and rich river deltas, were swept away by the drifts of stronger men who were nourished on the hardships of deserts and mountains and who were more capable with the sword. Unknown and unnumbered billions of men have been so destroyed in prehistoric times.
Its agricultural lands, chiefly those portions of deltas and meadows at the mouths of streams not subject to overflow, embrace in the aggregate, only a few hundred acres, the largest tracts on the west coast, lying at the head of Kio-kath-li, Tattoo and Athlow Inlets, not exceeding twenty acres.
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