In which continent is the Atacama Desert located?

What is the elevation of the highest peak in Australia? What is the elevation of the highest peak in Europe? What mountain range is Mount Aconcagua a part of? What is the name of the mountain range that includes Mount Elbrus? In which country is the Thar Desert located? What is the name of the desert that covers parts of Argentina and Chile? Which desert is located in the Horn of Africa? What is the name of the largest desert in South America?