WAEC 2023 Geography · Question 3
Which of the following is a wind deposited landforms?
Options
- A.Rock pedestal
- B.Yardang
- C.Deflation hollow
- D.Loess
Answer: D. Loess
Explanation written with AI and checked against the answer key
Step 1: Analyze the question The question asks for a landform made by wind deposition (where material is dropped), not by wind erosion (where material is removed or worn away).
Step 2: Explain the concept Wind shapes the land in two main ways:
- Erosion through deflation (lifting and blowing away loose material) and abrasion (sandblasting rock surfaces).
- Deposition, when the wind loses energy and drops the material it carries. This gives features such as sand dunes and loess.
Step 3: Check each option
- A. Rock pedestal: Formed by abrasion, which wears away the base of a rock more than the top. This is an erosional feature.
- B. Yardang: A streamlined ridge of rock carved by wind abrasion. This is also erosional.
- C. Deflation hollow: A depression left after the wind blows away loose material. This is erosional too.
- D. Loess: A fine, yellowish, fertile windblown silt that settles in thick layers, often far from its source. It is a depositional feature. In Nigeria, the fine dust carried by the Harmattan from the Sahara is a similar kind of windblown material.
Step 4: Answer Only loess is formed by wind depositing material, so the correct option is D.
Tip: Think of how each name sounds. "Deflation" means material is taken away, and "pedestal" and "yardang" are rocks left standing after being carved. Loess is the one that is laid down as a blanket of dust. Other depositional wind features to remember are sand dunes and sand ripples.
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