Subsidences in different places begin and end with utter irregularity; and hence the groups of strata thrown down in them can but rarely correspond.
It is not easy on this supposition to explain elevations andsubsidences of small area.
If this is the case, subsidences of the land are natural concomitants of a glacial period, and will powerfully aid in removing all evidence of its occurrence.
In fact, one or two subsidences of considerable extent have already taken place, due in part no doubt to the dissolving action of rain water, but in part also to the mode of working.
This was done, with the result that there were serious subsidencesof the canals, involving both much loss of water and heavy expenditure in repairs.
The manner of dealing with the subsidences when they occur, as well as providing against them, will be found described in the book.
Earthwork Slips andSubsidences upon Public Works: Their Causes, Prevention and Reparation.
It spread itself to the southward, and was finally destroyed in the great subsidences and disturbances which closed the Devonian age, and which were probably accompanied with refrigeration of climate.
We may suppose that the transference of molten matter from one region to another may be among the causes of slow subsidences and elevations.
Many earthquakes originate beneath the sea, and in a number of examples they seem to have been accompanied, as soundings indicate, by local subsidences of the ocean bottom.
Moreover, there are gigantic fissures, running for several miles, caused bysubsidences of the underlying sections.
Now we might imagine a similar event, or a series of subsidences to have formerly occurred on the eastern side of Etna, although such catastrophes have not been witnessed in modern times, or only on a very trifling scale.
We may conclude, therefore, either that the original depth of this part of the Bay of Bengal was excessive, or that subsidenceshave occurred in modern times.
The subsidence of Papandayang is of importance as a historical fact; and it is not at all unreasonable to suppose that larger chasms of great depth were also sudden subsidences of a similar character.
Why do subsidencesoccasionally follow these movements of elevation?
We are certain that the augmentation, if any, has not been equal to the elevation, for subsidences to a great amount are known to have taken place.
Is it meant that these subsidences are so sudden and unforeseen as to sweep away great nations in an hour?
The different races which succeed each other on the earth are said to be separated by catastrophes, among which continental subsidences occupy a prominent place.
In this way the great cavities under Northwich which cause all the subsidences are made; they will grow bigger and bigger as long as the pumping up of brine is continued.
The area over which these subsidences take place is about two square miles.
One of the most remarkable features of these subsidences is that no loss of human life has occurred.
The subsidences already mentioned are almost invariably caused by the pumping away of the brine.
For the subsidences correspond with the amount of salt taken from the earth.
Other subsidences are caused by the falling in of old and disused salt mines which have not been properly worked, or worked too near the surface.
But the mining of the upper bed of salt by man does not account for the subsidences here recorded.
And a well-known authority declares that thesubsidences during the present century form an excavation very much more extensive than was required for the Manchester and Liverpool Ship Canal.
The result of these subsidences is generally seen in the formation of huge lakes of water called "flashes.
Gradually the sea encroached upon this land from the south, owing chiefly to extensive subsidences having taken place.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "subsidences" in a variety of sentences. We hope that you will now be able to make sentences using this word.
