Answer:
What kind of nut is empty at the center and has no shell.
I wear a red robe, with staff in hand, and a stone in my throat.
Though desert men once called me God, today men call me mad. For I wag my tail when I am angry. And growl when I am glad.
It's like food but water kills it. What is it?
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
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.