Caverns are formed in which environment?

• A. Caves
• B. Hot springs
• C. Swamps
• D. Glacial lakes

Answer: (A)

Caverns form as underground voids within rock, most often in limestone, created by dissolution of rock by slightly acidic groundwater. Over long periods, water seeping through cracks widens openings and carves out interconnected chambers, which become the caverns inside a cave system. This underground, karst-like process is what defines where caverns develop—beneath the surface in rock formations that can be dissolved—so the environment is essentially a cave. Hot springs, swamps, and glacial lakes involve surface water bodies or other surface processes and don’t provide the sustained underground dissolution needed to form caverns.