What property of water causes a water droplet to be shaped like a dome?

Question

Also can you please explain these words?
Surface temperature, surface area and surface tension.

Answer 1

I suppose the most appropriate word for the droplet of water is surface tension but you may also hear the word cohesion used.
Surface temperature is the temperature at the surface rather than on the interior.

http://en.wikipedia.org/wiki/Surface_area

http://hyperphysics.phy-astr.gsu.edu/%E2%80%8Chbase/surten.html