The order of physiographic units in Brazil while going from north-west to south-east. a) Parana river basin- Guyana highlands- Brazilian highlands. b) Guyana highlands- Amazon river basin- Brazilian highlands. c) Coastal plains- Amazon river basin – Brazilian highlands.
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Rivers have a major influence on the rocks and soils over which they flow. ... When a river overflows its banks, the nearby areas get flooded. During the flood, a thin layer of fine soil and silt gets deposited over the land, thereby forming rich alluvial soil which is highly fertile and nutrient-dense for the plants.
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