What are two differences and one similarity between the atacama desert and the altiplano?and you very

The similarity is that both are a Plateau: a vast area located relatively high, but which is rather even (this distinguishes it from a mountain range).

The differences are:
-while Atacama is barely populated, the Altiplato has a number of cities, such as Cuzco
-The Atacama receives less precipitation than Altiplato

Afine-grained igneous rock forms as a result of slow cooling.