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Across
  1. 3. a prolonged period of abnormally low rainfall; a shortage of water resulting from this.
  2. 5. is the watering of land to make it ready for agriculture.
  3. 6. biological community of interacting organisms and their physical environment
  4. 10. a member of a small independent group taking part in irregular fighting, typically against larger regular forces
  5. 11. bomb a bomb that derives its destructive power from the rapid release of nuclear energy by fission
  6. 12. river flowing SE from the Himalayas in N India into the Bay of Bengal
Down
  1. 1. guard any of various radical or socialist groups, in particular a militant youth movement in China
  2. 2. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous
  3. 4. a biological community of interacting organisms and their physical environment
  4. 7. Zedong Chinese Communist leader: chairman of the People's Republic of China
  5. 8. a southeast Asian country on the South China Sea.
  6. 9. extreme scarcity of food
  7. 13. endian political leader: prime minister