Convection<span> in the solid mantle drives the many processes of plate tectonics, including the formation and movements of the continents and oceanic crust.</span>
~Hello there! ^_^
Your question: This large peninsula country is mostly a desert in Asia..?
Your answer: Saudia Arabia is the country that is mostly a desert in Asia. It is the largest country on the largest peninsula in the world.
Happy Studying!