These spheres are closely connected. For example, many birds (biosphere) fly through the air (atmosphere), while water (hydrosphere) often flows through the soil (lithosphere). ... Interactions also occur among the spheres; for example, a change in the atmosphere can cause a change in the hydrosphere, and vice versa.
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B is the correct answer. The exosphere is the outermost region of the atmosphere the gradually merges out into space. The water cycle does not occur within this region.
