Rather they metaphorically described similar manifestations observable in the creation. They were called space, fire, water, wind and earth. Space is pretty easy to understand. Fire is any brightness, heat, energy, or transformation. So this could include sunlight, atomic energy, digestion, or electricity as well as flame.
Water includes all liquids.
Wind includes all movement, of air but not just air. Perhaps it also includes all gases. Earth includes all tangible material not just dirt. The whole universe is seen as being made up of these elements in different combinations. Talking about the Goddess as the whole universe may make the divine seem distant.