Here's why:
* Weathering: The primary process involved in the formation of Carlsbad Caverns is chemical weathering, specifically the dissolving of limestone by slightly acidic groundwater. This groundwater, slightly acidic due to dissolved carbon dioxide, reacts with the calcium carbonate in the limestone, forming calcium bicarbonate which is soluble and can be carried away in solution. This process widens existing cracks and fractures in the limestone, creating the caverns.
* Erosion: While weathering is the main driver, erosion plays a role in shaping the caves. The dissolving action of the water also carries away rock fragments and sediments, contributing to the gradual enlargement of the caverns.
In short: Weathering (dissolution of limestone) is the primary process that created the vast spaces of Carlsbad Caverns, while erosion contributes to their shaping and enlargement.
