Crystal's grow by a process called nucleation.
yes
NO
there are materials inside of the crystal to help them grow
A small quartz crystal can grow about 1mm a week assuming it is in a stable matrix.
a nucleus or plural nuclei
A crystal
how cold?
no
Yes, but not in the way that living things grow. Crystals are not composed of cells.
sugar
with salt and bioling water
actually, water is made up of 2 hydrogen molecules and 1 oxygen molecule. (h2o) therefore, you cannot GROW a water crystal.