GENERAL KNOWLEDGE

Detailed explanation-1: -The capital cities of Buenos Aires, Argentina, and Montevideo, Uruguay, practically face each other across the estuary. The Paraguay/Paraná River basin supplies water to the plains biome, or Pampas, of South America. The Pampas have rich, fertile soil and predictable rainfall patterns.

Detailed explanation-2: -South America has areas of wide plains. The plains offer rich soil for growing crops and abundant grasses for grazing livestock. The vast, grassy, and treeless plains of Colombia and Venezuela are called llanos.

Detailed explanation-3: -Less moisture reaches the eastern side of the mountains, creating a rain shadow with arid and dry conditions for the region called Patagonia in southern Argentina. The Andes are not as high in elevation in the south, which allows some precipitation to fall on the rain shadow side.