hello dear, do you have any experience of a desert?  is a barren area of landscape where little precipitation occurs 
Oh cool! Where do they usually occur?
they consequently live conditions and hostile for plant and animal life.
Really? Interesting! What else?
do you know that  one third of the land surface of the world is arid or semi-arid.
Wow! I really didn't! I did hear that the cactus plant is grown in the dessert... is that true?
don't have much idea, will research on it, but the desert is classified by the temperature that prevails, 
Ok, that makes total sense! I will look up more info on that!
desert is also classified by  the causes of desertification