1. if there was liquid in the tower, then why did it only pour out when the new liquid was poured in? 2. What caused the color change in the liquid from blue to purple? 3. Why did more fluid come out than want in?

the answer to your question is a plant

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

not only is it colder, it also becomes darker, less salty, and more dense.