Explanation

(a) ROCK PEDESTALS:
Characteristics:

• It has soft and hard rock layers, mushroom with irregular shape formed in desert e.g Sahara desert
• The soft rock layers is eroded more rapidly resulting in the formation of irregular edge of alternate bands of hard and soft rock.
• Further erosion at the base produces a mushroom-shaped feature .

(ii) YANDANG: This is an erosional  feature formed by wind abrasion in  desert e.g Atacama desert. It has vertical bands or hard and soft rocks  of height between 5-15cm.
Characteristics:

• Yandang is found in the desert.
• Vertical bands of hard and soft rocks standing in the direction of prevailing wind is eroded such that Rock the softer rock is eroded faster than the hard rock resulting in the formation of Yandang. 

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