Answer:
As a state in America I am round on both sides and high in the middle.
What loses its head in the morning but gets it back at night?
Send poorly behaved children to me and let them sit here. What am I?
A dagger thrust at my own heart dictates the way I'm swayed. Left I stand and right I yield to the twisting of the blade. What am I?
I am gentle enough to soothe your skin light enough to fly in the sky and strong enough to crack rocks.
Give it food and it will live, give it water and it will die.