Hi Herma. You may want to start by looking at our guides to these subjects:
History - http://www.topuniversities.com/courses/classics-ancient-history/guide
Geography - http://www.topuniversities.com/courses/geography/guide
Social sciences - http://www.topuniversities.com/courses/social-sciences/guide
As you can see, social sciences usually refers to a group of subjects, including sociology, economics, law, finance and politics. Meanwhile history and geography are more often classed as humanities. However, there is often overlap between these groups - humanities and social sciences subjects are all connected to human behaviour in some way.
Hope this helps, do let us know if you have any more questions!
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