Question

Why plain areas have thick soil

Answer 1

becoz of the minerals

Answer 2

It is thicker near major rivers and becomes thinner away from the rivers. Loess is also thicker on nearly level uplands and thinner on sloping areasbecause it was eroded during and after the time of loess deposition. ... Alluvium, sediment recently deposited by water, is the parent material of soilon flood plains.


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