The map image below shows how erosion occurred between 1882 and 1955.

Whatever erosion occurred, though, was generally slight and far less than the slide that characterized most of the 1990's.

The erosion of political coverage on broadcast networks has been occurring for several elections.

Such erosion does not occur in healthy democracies with oil.

"We'd gotten the idea for some time that erosion was occurring," he said.

The witnesses differed over whether an erosion of safety had occurred with the growth in air traffic.

To recreate that national purpose, we need to understand why the erosion occurred.

But any erosion of support for sanctions occurred before 9/11.

It is usually only exposed at the surface after uplift and erosion have occurred.

Why erosion occurs in certain hot spots and not others is only partly understood.