Answer:
Who keeps the ocean clean?
I am a word. I become longer when the third letter is removed.
Sometimes I fly as fast as the speed of light. Sometime I crawl as slow as a snail. Unknown until I am measured but you will certainly miss me when Iām gone.
Lighter than what I am made of, more of me is hidden than is seen. What am I?
I can make arrows fly. I can make kites soar. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.