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If the cracks are particularly wide or deep, fill them in stages. Each layer should be no more than about /£in (1 2mm) deep. Scoi surface provide the surface to provide a key for the next layer, which you apply when the previous layer is set but not dry. With the final undero set (allow 1 -2 hours) and scored, apply the finishing coat of plas flush with the original Wall surface. When smoothing the finish plaster, it may help to dampen the surface slightly, but don't overwet it or it will become dusty. The filling material is likely to absorb more paint or wallpape paste than the original plaster, so prime it with one or two coats universal primer or latex before starting to redecorate.

Where current revenues do not provide sufficient funds for urgently needed road improvements, borrowing is justified. It is generally held that highway debt should be repaid within the life of the improvements made. Highway surfaces wear out and must be replaced, but grading has permanent value and drainage structures last for a long time. When a surface is worn out, it still has value as a base for a new surface. One third or more of the cost of a new highway may be for improvements that will be of value for many years after the original surface is replaced.

Sedimentary rocks are important because they provide oil, natural gas, coal and building stone. They are of great interest, too, because they were formed at the earth's surface and provide much evidence of its nature many millions of years ago. Fine red sandstone [3], for example, indicates the former presence of deserts. The study of ancient environments through the analysis of present-day rocks is called stratigraphy.