Answer:
What are the options we can't help without them
Answer: During the water cycle some of the water in the oceans and freshwater bodies, such as lakes and rivers, is warmed by the sun and evaporates. During the process of evaporation, impurities in the water are left behind. As a result, the water that goes into the atmosphere is cleaner than it was on Earth.
Slavery is what separated the north and the south. Its what caused the civil war. the north wanted to abolish slavery but the south needed it.