Answer:
I save lives on the ground and in the air
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
I am heavy forward, but backward I'm not. What am I?
If two's company and three's a crowd what are four and five?
A butcher is 6 feet tall and wears size 12 shoes. What does he weigh?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.