In the four classical elements, earth is considered the ultimate feminine element. In the spring, at the time of new growth and life, the earth quickens and grows full with the beginnings of each year's crop. The image of Earth as Mother is no coincidence -- for millennia, people have seen the earth as a source of life, the ultimate womb.
The Hopi peoples of the American Southwest indicated Earth not as a triangle, but as a labyrinth with one opening; this opening was the womb from which all life sprang. In alchemy, the element of earth is represented by the triangle with a crossbar.
In the Tarot, Earth is associated with the suit of Pentacles. It is connected with abundance and fertility, with green forests and rolling fields. Invoke Earth for workings related to material wealth, prosperity, and fertility. This is a symbol to use when connecting with the comforts of home, the blessings of the hearth, and the stability of family life.