* Slightly acidic water: Rainwater naturally absorbs carbon dioxide from the atmosphere, forming a weak carbonic acid. This acidic water seeps into the ground and eventually reaches limestone bedrock.
* Dissolving limestone: Limestone is primarily composed of calcium carbonate. The weak acid in the water reacts with the calcium carbonate, dissolving it and creating small cracks and crevices in the rock.
* Enlarging cavities: Over time, the process of dissolution continues, gradually widening these cracks and crevices into larger cavities, eventually forming caverns.
Other factors that contribute to cavern formation:
* Fractures and joints: Pre-existing weaknesses in the limestone, like fractures and joints, allow the acidic water to penetrate more easily.
* Groundwater flow: The movement of groundwater through the rock helps to transport the dissolved material and further enlarge the cavities.
* Time: Cavern formation is a very slow process, often taking thousands or even millions of years.
So, while other types of weathering might play a role in the overall landscape, it's primarily chemical weathering, specifically dissolution, that is responsible for the creation of caverns.
