Question

why is the playground deserted?

Answer 1

hi here's your answer. 
playgrounds are deserted because children play in playground and the sand used for deserting it prevents them from getting injuries.

Hope it helps you. 

Answer 2

it is deserted because of making surface flatter and
in rainy season there are less chance of mud occurs or water stored in the ground.
it also prevent from grsses
and make surfsce softier.