Which term refers to all land on Earth, including core, mantle, and crust?

• A. Cryosphere
• B. Geosphere/Lithosphere
• C. Biosphere
• D. Troposphere

Answer: (B)

Think about Earth as layers of solid material together forming the planet’s bulk. The geosphere refers to all of that solid part—the rocks, minerals, and the interior from the crust down to the core. It includes land surfaces as well as the deep interior, so it fits the idea of “all land on Earth, including core, mantle, and crust.” The lithosphere is the outer rigid shell of crust plus the upper mantle, but the geosphere covers the entire solid body, making it the best fit. The other terms describe different parts of Earth: the cryosphere is the frozen water areas, the biosphere is all living things, and the troposphere is the lowest layer of the atmosphere. So the solid Earth is the geosphere (often discussed together with the lithosphere).