The chronological order of the approaches in Human Geography is as follows:
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(C) Exploration and Description came first, as geographers sought to understand and describe different regions.
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(D) Areal Differentiation followed, focusing on the differences across places.
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(A) Spatial Organisation came next, emphasizing the spatial patterns of human activity.
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(B) Post-modernism came last, challenging earlier ideas with a more subjective approach to human geography.