Fact, The Earth is composed of four major subsystems., Oceans, rivers, and lakes are part of the hydrosphere., The biosphere contains all living organisms., The geosphere includes rocks, soil, and mountains., The atmosphere helps protect Earth from harmful radiation., Changes in one Earth subsystem can affect the other subsystems., Opinion, The atmosphere is the most important subsystem of the Earth, Earth is the most beautiful planet in the solar system., Learning about Earth's subsystems is exciting., Plants are the most useful organisms in the biosphere..

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