Ask most of the middle east
They will say "Water desalination".
Ask a survivor, he would say
"Distillation".
Algae is warmful for the organisims of the area
Nation states are difficult to create because of colonies ((tell me if u need to know why because I can help with that))
Answer:
The most vital function of Earth's magnetic field is to deflect most of the solar winds. The solar winds are dangerous level of radiation, that would kills us without our magnetic field.
During the medieval era the Catholic Church became a more elaborate heirachy. The pope became an image of of supreme power in Europe. There was also a large population growth. Towns and cities wanted more self control. This caused a political and social struggle.
This struggle caused a huge demand of a more direct experience with Christ. Christ and his apostles became an image of more radical simplicity. The church became made a huge impact in daily life. It served as a spiritual and religious guidance. The church also made an impact into Europe's government.