Final answer:
Karst is the correct term for landscapes where limestone erosions create deep valleys and caverns, resulting in picturesque features and caves.
Step-by-step explanation:
The word from the list that best fits the definition of a landscape in which limestone is eroded to form deep valleys and caverns is Karst. Karst landscapes are formed through the chemical weathering of limestone by water, resulting in the formation of features such as sinkholes, caves, and underground rivers.
Karst topography is characterized by the dissolution of soluble rocks like limestone, which leads to features such as sinkholes, disappearing streams, reappearing springs, and elaborate cave systems. Over time, water erodes the limestone, creating a distinctive and often scenic landscape. Notable examples of karst landscapes include the Stone Forest in Yunnan Province, China, known for its steep limestone pinnacles, and the Viñales Valley in Cuba, with its bread loaf-shaped hills and economic significance for tourism and agriculture.