Translation of Statik

I need to write you one more sentence. This is what my teacher told me and the German language is so difficult. So please, as a last favor, would you please write the sentence for me in German?
Unfortunately, it is a natural and eternal phenomenon of human beings. Whereever people have been, it appeared too. Please let me define racism in my next email to you and please share also your thoughts.
We walked by waterfalls and rivers, but the water was too cold to swimm in. The hike made us tired and we were in the valley, which meant that we had to climb up again. The climb was difficult.