Conversation so far:
where is the atacama desert located in south america
According to the World Wide Fund for Nature, the Atacama Desert occupies a continuous strip for nearly 1,600 km along the coast of the northern third of Chile.
how big is the atacama desert
According to estimates, the Atacama Desert occupies 105,000 km2, or 128,000 km2 if the barren lower slopes of the Andes are included.

Question: what does the desert comprise of
Self-contained rewrite: what does the atacama desert comprise of