Wind as an Agent of Gradation

What is the primary reason wind is a significant agent of gradation in desert regions?

• Dryness and lack of vegetation

• Abundance of vegetation

• High humidity levels

• Presence of large water bodies

Which type of sand dune is characterized by a crescent shape with horns pointing in the wind's direction?

• Star Dune

• Transverse Dune

• Barans Dune

• Parabolic Dune

What is a longitudinal dune also known as?

• Barchan Dune

• Seif Dune

• Star Dune

• Parabolic Dune

Which type of desert is characterized by extensive sand dunes?

• Stony Desert

• Rocky Desert

• Sandy Desert

• Cold Desert

In which countries can stony deserts, known as regg, be found?

• Sudan and Chad

• Algeria, Libya, and Egypt

• Saudi Arabia and Yemen

• Morocco and Tunisia

What is the process called when wind removes sand particles, leaving behind a surface of coarse material?

• Erosion

• Sedimentation

• Deflation

• Abrasion

How does abrasion contribute to wind erosion?

• By dissolving rocks

• By carrying water particles

• By freezing and thawing

• By driving sand particles against objects

What type of landform is created by wind erosion and has a narrow trunk with a broad top?

• Mesa

• Butte

• Mushroom Rock

• Plateau

What happens to wind-blown materials when the wind's velocity decreases?

• They become heavier

• They evaporate

• They are deposited

• They are carried further

What is loess, and where is an example of it found?

• A desert plant found in Saudi Arabia

• A type of sand dune in Rajasthan

• Wind-blown soil deposits, example in North China

• A type of rock found in the Sahara