Across
- 2. Advanced watering system for farming
- 3. One of the first civilizations(2500 B.C.E)
- 5. One advanced system that wasn't considered to be possible at the time but is
- 6. Reason for decline
Down
- 1. Somehow we know more about Egypt's writing system than the actual alphabet Indus' have
- 4. Something we only made in 1902 but they had it down 2500-1800 B.C.E