The answer is false. deserts do not advance linearly or in mappable patterns because of the nature of changing weather patterns. they are formed by erosion, and the sand particles usually travel through wind, as the wind carries the particles, it shifts the shape of sand dunes and deserts over time.
A tourist might see a Samba Dance at a Brazillian Carnival. The Samba is very popular in Brazil.
~Silver
The Atacama desert is in Chile I do nit think their is a significant desert in Argentina.