Answer: central heating system
The surface features that is been developed when limestone is been dissolved by water and disappearing streams is Karst.
- Karst can be regarded as the type of landscape, and in this landscape bedrock are been dissolved which create sinkholes as well as sinking streams.
- It us usually associated with soluble rock types such as ;
limestone
marble
gypsum
Therefore, Karst is the right term.
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The correct answer is Ganges. It is also known as the Indo-Gangetic Plain and the North Indian Plain.
