Ironically, as Americans now take that message abroad, the tradition has been deeply eroded at home.

It was an old dry watercourse, deeply eroded before its source turned elsewhere.

It is a deeply eroded and highly faulted limb of an overturned fold.

This ancient formation has been deeply eroded by subsequent impacts, to the point where only the western part still resembles a crater.

The crater is deeply eroded and its original size must be inferred by indirect means.

Since then the crater has been deeply eroded, and no trace of its original surface morphology is visible.

It is deeply eroded by various streams into spurs.

Its last activity was about a million years ago, and it has been deeply eroded by glacial activity.

The statues were deeply eroded from the dripping water and appeared to be extremely old.

The rim of this crater has been deeply eroded, and now forms a low, somewhat irregular ridge around the interior floor.