Answer:
I am milky white and scares people.
I am all around yet to me you are half blind. Sunlight makes me invisible and difficult to find.
you can throw me away but I will always be coming back
I have cities without people forests without trees and oceans without water. What am I?
I am a cave full of bones and the house of a worm.
Give it food and it will live, give it water and it will die.