Indeed, contributing to the Republicans' distress is a round of polls last week that found a deep erosion of public support for Republicans in Congress.

Areas, in which deeper erosions persisted, were largely identical with those areas which exhibited haemorrhagical damage at the macroscopic level.

But almost every other measure in the survey indicated a deep erosion in Mr. Reagan's popularity.

If the parent rock is hard, this can cause quite deep erosion of the rock over many years.

But the broader stock market continued to show signs of a deep erosion in prices.

This caused deep erosion in upland areas and has left widespread superficial deposits.

The two main difficulties with predicting burial history are presented by deep erosion in the mid Jurassic and the late Cretaceous.

These explosion craters are interpreted to have formed above rubble-filled volcanic pipes called diatremes; deep erosion of a maar presumably would expose a diatreme.

The foreground is a classic split ridge or doppelgrat, spreading under tension due to deep erosion in the valleys either side.