Which of the following best describes the slash-and-burn technique? a. incinerating farmland to provide fertilizer for crops b. intensive weeding to keep crops growing c. ploughing the prairie sod to loosen the soil d. planting on floodplains to use water resources

The slash-and-burn technique involves burning existing vegetation for two reasons: first, to clear the place quickly rather than having to manually cut all the plants away; and second, to allow the burned plant material to settle into the soil and serve as fertilizer. Therefore the best of the choices is A.

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