Which term describes large, ancient, stable parts of the earth's landmasses?

• A. Crust
• B. Cratons
• C. Core
• D. Eruption

Answer: (B)

Cratons are the large, ancient, stable parts of the Earth's landmasses. They form the old, rigid cores of continents and have remained coherent for billions of years, protected by thick, cool lithosphere that resists deformation. These regions include shields—exposed, ancient crystalline rocks—and platforms, which are shields covered by relatively thin sediment layers. This stability contrasts with younger, more tectonically active crust at plate margins, and with other Earth features like the core or volcanic eruptions.

Crust refers to the entire outer shell of the planet, including younger, less stable regions—not specifically the ancient cores. The core is the Earth's inner region, not part of the landmasses. An eruption is a volcanic event, not a geographical feature.