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Duricrust From sources 1-5 The Australian continent is unique in a number of ways.

It is the driest, flattest, oldest, it has the most erratic climate of any continent, and much of it experiences great extremes of rainfall both during a year and from year to year.

According to Twidale & Campbell, the compact shape of the Australian continent has contributed to the tendency for widespread plantation, with few major indentations or embayments along the extensive coastline.

This meant that as sea level changes occurred the resulting changes of river behaviour were limited to the margins of the continent, with the coastal rivers being the only rivers affected, the inland rivers being shielded from such impacts.

A place where salt is a serious problem is the West Australian wheat belt.

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The ratio of shore length to land area of about 1 km of coast for every 390 km (0), while the ratio of coast to land area of peninsula and insular Europe is .And most of Australia spent many millions of years covered by seas.In many places these seas were eventually cut off from the ocean and evaporation formed huge salt deposits which were later buried.Depositional plains are also a prominent feature of inland Australia (Twidale & Campbell, Source 5).These components have determined the outline of the continent and the overall pattern of drainage and relief.So added to this impoverished state of the soils there are vast areas where there are salt deposits beneath the surface which means when land is cleared for agriculture the removal of deep-rooted trees and shrubs mean the water table rises.

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