Answer:
I am a portal to another world which you cannot enter. Only you can see me but I can't see you.
Who keeps the ocean clean?
I am a rock group with four members all of whom died in plane crashes. Who am I?
What can run but never walks licks but never talks has a bed but never sleeps has a mouth but never eats?
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?