下图反映了我国某地区的土地利用转换图。左图为1972年的土地利用状况，右图为2001年的土地利用状况。期间该区人口剧增。读图，回答下列问题。

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（2）说明a地的地貌名称及其形成过程。

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Sweat damage will occur in a cargo hold containing machinery parts when（）.

A.the outside air is colder than the cargo

B.the air temperature of the hold is higher than the outside air temperature

C.the dew point of the hold is higher than the temperature of the cargo

D.the dew point of the outside air is lower than the temperature of the cargo