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"Stony cove has steep sides, whose frequent knife-like edges have been carved out by erosion; on either side are crags and high, serrated mountain peaks. Slide mountain, about ten miles southwest from Phoenicia, has an elevation of four thousand two hundred and thirty feet; being the highest in the Catskills. About six miles from Phoenicia lies the village of Shandaken.
The Grand Canyon Character of the Colorado River The Water-Gods; Erosion and Corrosion The Natives and their Highways The "Green River Valley" of the Old Trappers The Strange Vegetation and Some Singular Animals.
LATERAL EROSION. On reaching grade a river ceases to scour its bed, and it does not again begin to do so until some change in load or volume enables it to find grade at a lower level. On the other hand, a stream erodes its banks at all stages in its history, and with graded rivers this process, called lateral erosion, or PLANATION, is specially important.
But what stumps me is the mountain range three thousand feet high, crossing the desert and the canyon just above where we crossed the river. How did the river cut through that without the help of a split or earthquake?" "I'll admit that is a poser to me as well as to you. But I suppose Wallace could explain it as erosion.
These, it is said, have lowered the summits by gradual erosion, and, with the material thus derived, have formed shoals in the sea which once beat against the cliffs; then, by successive deposits, gradually raised them above the surface, and finally expanded them into broad plains traversed by gently flowing streams.
This island is as solid as a pancake; I don't understand it. By all the rules of the game there shouldn't be anything left here but the tree by this evening. There doesn't seem to be any process of erosion." "What will we do If the island washes away from under us?" asked the boy they called Brownie. "The tree'll fall over sideways, won't it?
Thus the gods of erosion are the artists, while the builders of the mountains are only ordinary workmen.
On the other hand, it seems more likely that the people who built Saylla were farmers and that when the lower Cuzco Basin was filled up by aggradation, due to increased erosion, they abandoned this site for one nearer the arable lands.
The transporting power of torrents is greatest soon after their formation, because at that time their points of delivery are lower, and, of course, their general slope and velocity more rapid, than after years of erosion above, and deposit below, have depressed the beds of their mountain valleys, and elevated the channels of their lower course.
It is also clear that if, by some chance, the precipitation of the high sources should increase, the corrasion of the stream-beds in the canyons would likewise increase and outrun with still greater ease the erosion of their immediate surroundings.
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