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The Sahara contains complex linear dunes that are ________ by almost 6 kilometers. 

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Tính từ “to lớn, khổng lồ” trong tiếng Anh là gì?  

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Danh từ “cause” nghĩa là gì?

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A _______ is a landscape or region that receives very little precipitation.

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Deserts are often composed of ________ and rocky surfaces

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Three great stretches of sandy deserts almost circle the center of Australia. 

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We used to climb up the crest of the hill to get a good view of the surroundings. 

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In the northern part of the Simpson Desert, the dunes are parallel.