Answer:
What is full of holes but still holds water?
What can you catch but not throw?
A little pool with two layers of wall around it. One white and soft and the other dark and hard, amidst a light brown grassy lawn with an outline of a green grass. What am I?
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
I am like thunder in your cranium
No matter how little or how much you use me, you change me every month.