This is a true statement!
For example, the biggest city in the Sahara (admittedly placed on the edge of it, on the Atlantic coast) is Nouakchott, the capital of Mauritania - it has 1 million people, so a great portion of the 2.5 million.
Another big city is Ghardaia in Algeria - of 100 000 people.
I think it’s a Small scale map
It really depends on which war the question is referring to, but if it's referring to WWII the answer would be true.
That’s called Compounding.
The answer is rain because it can snow, hail, or sleet in tropical wet climate areas.