Davis for a nearly level surface of subaerial denudation, as opposed to a plain of marine denudation.
The present drainage-systems must have originated at the same time, and the sculpture of our continent has been carried on more or less continuously by subaerial agents from Miocene times to the present day.
While subaerial denudation reduces the land to baselevel, the sea is sawing its edges to wave base, i.
Compared with subaerial denudation, marine abrasion is a comparatively feeble agent.
Borings made in the deltas of great rivers such as the Mississippi, the Ganges, and the Nile, show that the subaerial portion often reaches a surprising thickness.
Such regions of faint relief, worn down to near base level by subaerial agencies, are known as peneplains (almost plains).
Hence it seems that along this coast, as at Bermuda and at Keeling Atoll, submarine and subaerial deposits are contemporaneously in process of formation, from the disintegration of marine organic bodies.
The whole is volcanic, and, from the absence of proofs to the contrary, I believe of subaerial origin.
They seem to have been of subaerial formation, and to have flowed from several points of eruption on the central platform, of which the Piton du Milieu is said to be the principal one.
On a rainy day, even in a gently undulating country, we see the effects of subaerial degradation in the muddy rills which flow down every slope.
Were it otherwise the subaerial denudation would be continually lessened by the diminution of the height and dimensions of the land exposed to waste.
Computation of the average annual Amount of subaerial Denudation.
Subaerial denudation would not of itself lessen the area of the land, but would tend to fill up with sediment seas of moderate depth adjoining the coast.
Such breccias may have been partly the result of the subaerial waste of an old land-surface which gradually sank down and suffered littoral denudation in proportion as it became submerged.
In addition to the two points of subaerial eruption on the New and Little Kaimenis, two other cones, indicating the sites of submarine outbursts of unknown date, were discovered under water near the Kaimenis during the late survey.
So signal indeed was this victory that, in later years, the destructive work of the sea has been not infrequently underrated in the almost exclusive attention given to land sculpture by subaerial agencies.
At about the time when the subaerial origin of valleys and escarpments was being established in England, the explorations and surveys of our western territories were undertaken, and a flood of physiographic light came from them.
It is simply monstrous to suppose that the terraces stretching on a dead level for leagues along the coast, and miles in breadth, and covered with beds of stratified gravel, 10 to 30 feet in thickness, are due to subaerial denudation.
He justly argues that if the strata were formed in shallow waters, and then exposed by upheaval to subaerial action, all shells and other calcareous organisms would be removed by solution.
The few still active volcanoes in Chile are confined to the central and loftiest ranges of the Cordillera; and volcanic matter, such as appears to have been of subaerial eruption, is everywhere rare.
They represent the quiet deposition in water comparatively deep of the products of marine erosion, and of the finer ejectamenta of some distant subaerial vent.
After the emergence the subaerial denuding agencies reshaped the surface, and as a result of the less yielding character of the materials filling the fissure, they protrude as a dyke-like mass from the crest.
They contain at times subangular fragments of more basic rocks; and are true tuffs in the sense that although perhaps deposited on a sea-bottom they represent the ejected materials of a subaerial vent.
In many localities this configuration of the surface would be attributed mainly to subaerial denudation.
There is nothing to indicate that this “core” of a volcanic mountain belonged to a subaerial vent.
No evidence of subaerialeruptions came under my notice.
It is remarkable that in the same neighbourhood where there is evidence of so great a submergence of the land during part of the glacial period, we have also the most decisive proofs yet discovered in the British Isles of subaerial glaciers.
Submarine and subaerial exhalations often occur in regions of earthquakes and volcanos far from points of actual eruption, and charged with sulphur, sulphuric salts, and with common salt or muriate of soda.
Where faults have influenced the superficial topography, it is usually by giving rise to a hollow along which the subaerial agents and especially running water can act effectively.
The same subaerialforces have eroded lake-basins, dug out corries or cirques, notched the ridges, splintered the crests and furrowed the slopes, leaving no part of the original surface of the uplifted chain unmodified.
These features, often so marked on the lower grounds, attain their most conspicuous development among the higher and barer parts of the mountains, where subaerial disintegration is most rapid.
In the vast tablelands of Colorado and other western regions of the United States an impressive picture is presented of the results of mere subaerial erosion on undisturbed and nearly level strata.
He entirely agreed with the doctrine of the subaerial degradation of the land and the erosion of valleys by running water.
In the generalsubaerial denudation of a country, innumerable minor features are worked out as the structure of the rocks controls the operations of the eroding agents.
Geomorphology is the part of geography which deals with terrestrial relief, including the submarine as well as the subaerial portions of the crust.
It will be seen that, from the point of view of subaerial erosion, a base-level plain is the only land surface which is in a condition of approximate stability.
The general process of subaerial erosion is divisible into the several sub-processes of weathering, transportation, and corrasion.
It was under such conditions that the general processes ofsubaerial erosion operated in south central Wisconsin, after the uplift of the quartzite and before the deposition of the Potsdam sandstone.
Since the goal of all material transported by running water is the sea, subaerial erosion means degradation of the surface.
Some kaolins appear to have been formed by weathering and others by subaerial action.
The Atlantic plain as a whole thus has three principal divisions: a submerged portion, a marsh portion, and a subaerial portion.
These rocks were upraised probably in part into lofty mountains, and then worn down by erosion nearly to sea-level, thus forming what is termed a peneplain, or a plain of subaerial denudation.
Hence, when we look into the great abyss, we have only to remember the enormous length of time that the aerial and subaerial forces have been at work to account for it.
Then try to fancy the eternity it has taken the subaerial elements to cut thousands of feet through this hard Catskill sandstone!
Along with this upheaval of the sea-bed there was extensive denudation and erosion of the strata, so that valleys were eroded over the subaerial tracts, and the Jordan-Arabah valley received its primary form and outline.
While subaerial denudation reduces the land to baselevel, the sea is sawing its edges to WAVE BASE, i.
As the submarine delta grows near to the level of the sea the distributaries of the river cover it with subaerial deposits altogether similar to those of the flood plain, of which indeed the subaerial delta is the prolongation.
This upland is an uplifted peneplain of subaerial denudation,[2] now so far advanced in a "second" cycle of weathering and so thoroughly dissected that to an untrained eye it appears to be only a country of hills confusedly arranged.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "subaerial" in a variety of sentences. We hope that you will now be able to make sentences using this word.
