What are two things influence the shape of salt crystals?

Answer 1

Salt crystals have cubic shapes because they are formed with ionic bonds which creates positive and negative ions, which attract. Because these ions are polar(positive and negative) they connect in a repeating pattern which results in a cubic shape.

Answer 2

The shape of salt crystals is influenced by temperature and rate of evaporation. Higher temperatures and slower evaporation rates tend to produce larger salt crystals, while lower temperatures and faster evaporation rates result in smaller crystals.