Answer:
What is black when you buy it red when you use it and gray when you throw it away?
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
What gets bigger the more you take away?
I am found on Mercury Venus Earth and Mars but not on Jupiter or Saturn. What am I?
I have keys but no locks. I have space but no room. You can enter but canβt go outside. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?