Translation of injustice in Spanish

I was wondering if you can tell me if few words how to study here because I don't know that's why I'm not on line most of the time,thanks. Can you help me explaining me how to do the lessons, I still don't understand it
We joined the mass and climbed it. The stones were a little slippery and I doubt that this place is accident free. Climbing big slippery stones was not an easy task but we managed it slowly.
The next morning we got up a little later than usual. After leaving our room we recognized that this town and region was stunning. Desert and high volcanoes all around us. The place was superb.