Which of the following is an example of a physical characteristic of the southern grassland countries?
a. amazon river
b. rio de la plata
c. himalayan mountains
d. rio grande

The correct answer is B. An example of a physical characteristic of the southern grassland countries is the Rio de la Plata.

Explanation:

Rio de la Plata is a large delta region that opens into the Atlantic between Uruguay and Argentina. The Rio de la Plata is South America's second largest river basin and in the delta flows several major rivers, including the Uruguay River and the Parana River. In the Atlantic outside, the nutritious freshwater from Rio de la Plata meets the cold Falklands stream from the south and the warm Brazilian stream from the north. On the river are the capitals of Argentina, Buenos Aires, and Uruguay, Montevideo.

As for the coasts of the river, they present very diverse characteristics. The Uruguayan coast belongs to the geological formation of the Brazilian massif, with high coasts and sandy beaches surrounded by dunes separated by rocky cables. The Argentine coast corresponds to the sedimentary basin of the Pampas, formed by limo plateaus that alternate with muddy and marshy plains.