Complete the flow chart below. Write NO MORE THAN TWO WORDS for each answer. Old assumption: Large dust particles

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问题    Complete the flow chart below.
Write NO MORE THAN TWO WORDS for each answer.
Old assumption:
Large dust particles (38)    more rain
New research:
More dust  less rain (because water too dispersed to form  (39) )
Conclusion:
Loss of topsoil in nearby areas  progressive  (40) of deserts