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2. The conditions shown in this 1936 photograph were caused mainly by
(1) Periods of widespread flooding
(2) Deforestation and overgrazing
O
(3) Global warming
(4) Drought and poor farming techniques​

2 The conditions shown in this 1936 photograph were caused mainly by1 Periods of widespread flooding2 Deforestation and overgrazingO3 Global warming4 Drought an class=

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Its number 4 I think

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