Who am I?

I've been observing you all, from above and from bellow, since my fall in this place. I try my best to keep myself clean and crystal, but pureness is not my strength: I rejoice in the mixture and dance in many swirls. I nurture all the creatures in my way, from the most beautiful fairies to the most horrible monsters, actually, I am inside you right now, I am the major part of you. But you keep abusing my willingness, discharging all your dense trash and countless junk through my torrents. Inside and outside you. Sometimes I pay back, destroying your constructions and lives with unsuspicious violence. My highest hope is that we can return to living in harmony someday, running side by side in so many idyllic landscapes that have already existed here.