The two biggest deserts are the Antarctic and the Arctic. Even though they are covered with ice, they are dry enough to be considered deserts.
The Sahara, spanning an
area of 8.5 million square kilometers (covers 29.6% of Africa)
is the world’s hottest desert and third in size. The Sahara is
only twenty percent sand, the rest of it is mostly made up of
bare rock, gravel, and pebbles.