Designing and Building

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Across
  1. 2. _________ clocks used sun to determine the time
  2. 4. ____________ travelled in search of knowledge
  3. 7. __________ was a famous Muslim architect known for his mosques with enormous domes
  4. 8. Vast networks of irrigation ________ is needed to water the fields
  5. 10. Rulers in Muslim lands founded new cities in such as ________ and Cairo
  6. 11. During Fatimid times, an attempt was made to make a __________ near Cairo
  7. 13. Arch bridges were built over rivers to let _________ from underneath
  8. 14. Imam Al-Muizz invented the __________
  9. 15. Engineers need to determine the number of people and _______ before starting the work
  10. 16. ___________ is lifted using a system of gear-wheels
Down
  1. 1. Engineers found a way to __________ mills and bring water
  2. 3. Engineers use __________ to design and construct different machines and buildings
  3. 5. ________ was invented by Greeks and improved by Muslim Scientists
  4. 6. A _______ is a barrier that is built across the path of a river to hold back the water
  5. 9. ____________has been used for lifting water for over four thousand years
  6. 10. They designed machines and buildings that were both useful and _____________
  7. 12. Different types of ________ have been used in different situations