where does water come from ?:)

Question: where does water come from ?:)
- Keywords:
  water
Asked by blunt to Asif, Laura, Lena, Sean, Viv on 14 Mar 2012.
- Laura Waters answered on 14 Mar 2012:
  
  It is all around us all the time. Some is in us, some in the air, some in the sky as clouds, some in the ground as rivers and some in the sea. It just cycles through all those on a regular basis. When you drink water just think it has been through that cycle many times before!
- Sean Murphy answered on 14 Mar 2012:
  
  We are lucky that the earth has so much water, as we all need it to live. Life on earth seems to have developed at the end of a period where the earth was bombarded with many comets, some 3.8 billion years ago. One theory states that water on earth may have been brought from space via many icy comets.

Question: where does water come from ?:)