Sorcerers with the Elemental Bloodline have the ability to change damage type on spells that do energy damage to their bloodline type because of this:
Bloodline Arcana: Whenever you cast a spell that deals energy damage, you can change the type of damage to match the type of your bloodline. This also changes the spell's type to match the type of your bloodline.
In the glossary, "energy damage" is defined as being [acid], [cold], [fire], [electricity], or [sonic]. That means that the Bloodline Arcana would not allow one to cast Magic Missile which has the [force] damage type as a fire damage spell.
Snowball has the energy damage type of [cold, water].
Can said sorcerer cast a Snowball that does [fire, water] damage?