The driest desert, where there has been no rainfall.

1. Atacama Desert
2. Desert of Siloli
3. Coastal Desert of Peru
4. La Tatacoa Desert

Orinoco, Amazon and La Plata drain into which ocean?

1. Atlantic
2. North Pacific
3. South Atlantic
4. South Pacific

Brazilian highland is the source of which river basin

1. Paraguay
2. Amazon
3. Orinoco
4. Araguaia

Rio de la Plata is an example of

1. gulf
2. bay
3. estuary
4. port