Answer:
I save lives on the ground and in the air
I wonβt break if you throw me off from the highest building but I will break if you place me in the ocean.
What comes once in a year twice in a week but never in a day?
Fashions change, but what can a person wear that is never out of style?
I have a mouth on my head and eat everything.
Iβm grown from darkness but shine with a pale light. Very round I am and always a lady's delight.