I think it is because water is a recycled resource.
Answer:
Ondol
Explanation:
Ondol (or Gudeul in Korean) - the traditional Korean home heating system is a unique invention of ancient Korea.
Answer: missions began in the late 1800's as an effort to convert Native Americans to Catholicism and expand European territory. There were 21 missions in all, from 1769 until around 1833.
Explanation:
They were fighting for Russia in order to expel the Turks from the Balkans.