C) Gran Chaco
Correct Answer: C
Solution :[c] The Gran Chaco is a vast geosyncline basin formed by subsidence of the area between the Andean cordilleras on the West and e Brazilian Highlands on the East as it filled with alluvial debris from there two features. Because of its alluvial character, the Gran Chaco is nearly stone free and is composed of unconsolidated sandy and silty sediments that are upto 10,000 feet (3.050 metres) deep in some places.
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