Could Waterbending Be Real?

The power of hydrokinetics or "Waterbending" as they call it in Avatar is an extremely rare ability for a human to posses (unlike in Avatar where over half of the Northern Water Tribe can Waterbend). Few people have said they can manipulate water and even fewer have proved it.

Is bending elements possible?

There are five known bending arts; four of them bend a specific physical element while the fifth bends the energy within the human body itself. The only case of any one person being able to bend multiple elements is the Avatar, who has the ability to practice all five bending arts.

Is it possible to Earthbend?

Lavabending is fairly simple to explain now that we understand earthbending in general. To melt rock, an earthbender just needs to apply enough pressure to it using electric fields so that it heats up and becomes liquid. To move lava, earthbenders would just use charging by induction like they do with typical earth.