By Arnab Banerjee WATCH RELATED VIDEO Submit Some scientists are still not sure how water is formed in the planet earth. Few believe that water is stored from the asteroids which collided with the planet and others think that it flourished from the earth's mantle through volcanos. Advertisement © 2017 HNGN, All rights reserved. Do not reproduce without permission. Advertisement 0 COMMENTS CLOSE COMMENT Get HNGN's Top Stories Newsletter Everyweek You have already subscribed. Thank you.