erosion

Then, to stop this "erosion," the obturating (sealing) primer came into use.

At the present rate of erosion it takes 2,640 years to eat away a mile.

There is also decivilization by erosion, and while it's going on, nobody notices it.

From top to bottom we have the unmistakable marks of erosion.

This cycle of events is called the erosion cycle or topographic cycle.

They vary with the climatic conditions which obtain on the erosion surface.

Here they have been developed on a plateau-like area on which erosion is sluggish.

Thereby its bed is swept clean, and then only does erosion become possible.

Erosion has been at the maximum in the mountains because of the heavy precipitation.

They were formed in an earlier cycle of erosion when the land was lower.