Answer:
Shifting agriculture: Some tribes made a living by practicing shifting cultivation or slash and burn agriculture. It was mostly practiced in north east arid central India. They cleared an area of the forest for agriculture. They cut down most of the vegetation of acerta in area. They set fire to the remaining foliage. The left over ash was rich in mineralsand thus served as a fertilizer. Here they cultivated crops. After harvesting the crops, they abandoned this area and cleared another plot for agriculture. This was because the soil lost its fertility and it was left fallow for some years.
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