Answer:
Who eats a lot of iron without getting sick?
Take one out and scratch my head, I am now black but once was red.
I build up castles. I tear down mountains. I make some men blind. I help others to see.
What has a bottom right at the top?
A skin have I, more eyes than one. I can be very nice when I am done.
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.