What Am I Riddles

Question: Thousands of orphans who lost their old home,
found by others who have lost their own.
To hide a secret that is obvious to all,
becomes even more obvious when the host falls.

What am I?

Question: What demands an answer, but asks no question?

Question: What is something that you always have with you but you always leave behind?

Question: What always eats but is always hungry?

Question: What goes up when the rain goes down?