What is happening II?

This task is about how water changes.
 
The photo shows a glass of water with some ice cubes in it.

Question 2Change answer

a) i)
What is happening to the ice cubes?
 
  ii) 
Why is this happening?

Question 2Change answer

b)  There are tiny droplets of water forming on the outside of the glass.
     Where is this water coming from?