Professional Paper 1386–A
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Figure 1–1. The Earth System. Its two primary components are the geosphere (the collective name for the lithosphere, hydrosphere, cryosphere, and atmosphere) and the biosphere; climatic processes, the hydrologic cycle, and the multiple biogeochemical cycles are interactive in the Earth System; the Sun is the primary source of energy. Graphic design by James A. Tomberlin, USGS.