Question

What are 'wadis' in the context of desert water sources?

1. Channels that are dry except during the rainy season.
2. A type of underground water storage system.
3. Natural springs found within desert areas.
4. Areas with permanent vegetation due to underground water.

• A. ii only
• B. i only
• C. i, ii
• D. iii, iv

Answer 1

Answer:

B. i only

• An exotic river has its source in a rainy area beyond the margins of the desert

• Examples of exotic rivers are

• - The Nile in Egypt, The Tigris and the Euphrates in Iraq, The Indus in Pakistan and The Colorado in the USA

• Channels that are dry except during the rainy season are called wadis in Arabic-speaking countries.

• Although the surface of the channel is dry, water is present underground and can be obtained using wells; in some regions, natural springs also supply water.

• As in the case of exotic rivers, the source of water in natural springs too lies outside the desert.