Question

Which of the following are permanent sources of water in a desert?

1. Oasis
2. Wadis
3. Exotic rivers
4. Artesian wells

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

Answer 1

Answer:

B. i, iii, iv

• The vegetated area around it is known as A permanent source of water in a desert and Oasis

• 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.