Africa geography choice board

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Across
  1. 4. A farming technique whereplants are burned
  2. 5. The cutting down of too many trees
  3. 6. A nomadic Arab of the desert
  4. 7. a grassy plain in tropical and subtropical region
Down
  1. 1. Spreading of desert land
  2. 2. provides enough food for the farmer but not enough for sale
  3. 3. A dry arid semi-arid region south of the Sahara