numberthirteen is correct in that she is a personification of Nature and the Earth. and Swirvin is correct in that Gaia is an ancient Greek Goddess who was the "Mother Goddess" of all living things. The Gaia theory is held by many Pagans. This is the belief that Earth herself is alive and an individual being in her own right. The magma that flows under the surface and the waters are her blood, the rock is her bones, The winds and air her breath. The soil her skin, and all the plants her "hair" the animals and other lifeforms on her are like the symbiotic (or parasitic as the case may be) lifeforms which exist within us that actually make it possible for us to live.