Answer:
I am mother and father, but never give birth or nurse. I'm rarely still, but I never wander. What am I?
I have 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.
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
I can be hairy and itchy all over. I hang on a stick. I can be the scariest thing you have ever seen. I stand in the middle of nowhere.
What happens when you throw a green stone into the Red Sea?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?