What Am I Riddles

Question: What is square and green?

Question: I am god to many people despite not being a spirit. I am what people kill over, lust over, and fight over. I am not God or the Devil, but a mere material that people need endlessly. What am I?

Question: What has a bed that you can't sleep in?

Question: What is only a small box but can weigh over a hundred pounds?

Question: A king without a crown.