5 Unknown facts about desert.

1.A quarter of our world is made up of dester,the biggest one is Sahara Desert in northern Africa.

2.Rainfall : A desert must have less than 2.5 CM(10 in)of rain per year.

3.Driest desert : Atacama Desert of South America.

                        Atacama desert

3. Coldest desert : the Gobi desert in Asia is the coldest in the world.

                          Gobi desert

4. Hottest desert : the Sahara desert is the hottest in the world.

                         Sahara desert

5. Biggest desert : the Sahara desert covers one-third of Africa.