Which set correctly names the four major Earth system components?

• A. Geosphere, Lithosphere, Hydrosphere, and Atmosphere
• B. Hydrosphere, Atmosphere, Magnetosphere, and Biosphere
• C. Geosphere, Hydrosphere, Atmosphere, and Biosphere
• D. Geosphere, Atmosphere, Biosphere, and Cryosphere

Answer: (C)

Think of Earth as a system made up of four broad parts: the geosphere, hydrosphere, atmosphere, and biosphere. The geosphere covers the solid Earth—rocks, minerals, landforms. The hydrosphere includes all water—oceans, rivers, groundwater. The atmosphere is the layer of gases surrounding the planet. The biosphere encompasses all living organisms and their environments. These four components are the standard framework for describing how matter and energy cycle on Earth and interact with each other.

Options that split the solid Earth into separate parts (like lithosphere) or add components from outside Earth (like the magnetosphere) aren’t counted as the four major components. Similarly, cryosphere (ice) is important but is typically viewed as a part of the hydrosphere or geosphere rather than a standalone major component. Hence, the set that lists Geosphere, Hydrosphere, Atmosphere, and Biosphere is the correct one.