Answer:
Supposedly we study history so that we don't make the same mistakes as we did in the past. Aside from that, history tells us what happened in the past. So if we wanted to know why we do some of the things today, we can take a look in the past and see how that came to be. And as for people who usually study history like geologists or whatever, they just like to know what happened way back when. To see what was here before us and whatnot. With history, we are also able to check our evolution. For example, we are able to see who made what discoveries and why they were important in history.