I'm causing scenes in the bays and isles. I'm on the screen when they check your vitals. I come in short, long, micro, and tidal. I am the hand up you say goodbye to.

I represent wishes, but I am not a bone or well. People think of me as distant and lonely.

It sounds like a sport but is naught of the sort, and is more like divorce although not in a court. It happens on scales far to small to be seen, unless uncontrolled; then all's smithereens.

I share a name with a famous singer, a legendary fantasy weapon and something certain invertebrates do. What am I?

I'm up and down and all around, you need me just to live. But even so I hate to glow and can take the life I give. What am I?