Yes you can because a cube is made out of 2-d squares. You can make 2-d squares out of a cube
This is because the sound you make when you say x is ex thus using a but when you make the b sound it sounds like be.
Yes, it is.
an alliteration occurs when a series of words in a row, or close together, have the same first consonant sound.
For a more intruiging writing, more interesting for the reader. it creates a better more imaginitive picture for the reader