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Quick Answer. The four spheres of the Earth are the atmosphere, the biosphere, the hydrosphere and the lithosphere. Each of these spheres is considered by scientists as interconnected in a greater geosphere that harbors all terrestrial life and materials.
Four is the sacred number of the Zia and is seen repeated in the four points radiating from the circle, each consisting of four bars. 1  To the Zia Indians, the number four represents: 2  the four points of the compass (east, west, north, and south); 3  the four seasons of the year (spring, summer, autumn, and winter);