What term describes a landscape formed by soluble rocks that have dissolved?

The term that describes a landscape formed by soluble rocks that have dissolved is "Karst." This specific type of landscape is characterized by features such as sinkholes, caves, and underground rivers, all resulting from the weathering and dissolution of soluble materials like limestone, gypsum, and salt. The dissolution process typically occurs when slightly acidic water, often from rainwater or groundwater containing dissolved carbon dioxide, seeps into the cracks and pores of the bedrock, gradually eroding it.

Karst landscapes are significant in understanding hydrology, as they play a crucial role in groundwater systems and can influence the ecology of the region. This formation differs from other landscapes mentioned in the choices. For instance, wetlands are areas saturated with water, deserts are arid regions with little precipitation, and deltas are landforms created by sediment deposition at the mouth of rivers as they enter larger bodies of water. These definitions highlight the unique nature of karst topography associated with the dissolution of soluble rocks.