Shower Thoughts: Where does water come from?

Each Tuesday, here on Nights we're aiming to answer those unshakable questions lurking in the back of your mind. Tonight... Where does water come from? Which seems like a very simple question but we guarantee you it's not! Helping us get to the bottom of this is Professor Ben Kennedy from the University of Canterbury's School of Earth and Environment Ben's main area of research is focused on volcanoes which might give you an idea about the answer to our question.