AP World - Technological Advancements

123456
Across
  1. 3. Drought resistant crop from China
  2. 4. A writing system for vietnamese
  3. 6. An object determine movement of heavenly bodies
Down
  1. 1. An arithmetic system created by Muslim mathematicians
  2. 2. Canal that connects the north and south of China
  3. 5. A writing system for Korean