Read the following passage and answer the questions given below:
Ladakh experiences very cold winters and dry springs. During winter, water from mountain streams is carried through underground pipes and sprayed into the cold air. The water freezes and gradually forms a tall cone-shaped structure called an ice stupa. During spring, the ice stupa melts slowly and provides water for farming and other needs when water is scarce.
3. Why is the ice stupa built in a cone shape? -
4. What can be inferred about the role of science and local knowledge in creating ice stupas? -