What is the cryosphere?

• A. All solid parts of Earth, including rocks, soil, and landforms.
• B. The layer of gases that surrounds Earth; includes air and weather.
• C. All the water on Earth, including oceans, lakes, rivers, and groundwater.
• D. All frozen water on Earth, such as glaciers, ice caps, and permafrost.

Answer: (D)

The concept being tested is what the cryosphere refers to. The cryosphere is the part of Earth that contains all frozen water, including glaciers and ice sheets, sea ice, ice in lakes and rivers, snow cover, and permafrost. It’s distinct from the lithosphere (the solid Earth like rocks and landforms), the atmosphere (the layer of gases around Earth), and the hydrosphere (all water on Earth, whether liquid or frozen). The key idea is that the cryosphere focuses on frozen water specifically, not all water. So describing all frozen water on Earth—glaciers, ice caps, and permafrost—directly defines the cryosphere, while the other options point to different Earth systems.