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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.
How to Calculate the Volume of a Sphere A sphere is a perfectly round geometrical object that is three dimensional, with every point on its surface equidistant from its center. Many commonly-used objects such as balls or globes are spheres.