A mineral is a solid formation that occurs naturally in the earth while a rock is a solid combination of more than one mineral formations which is also occurring naturally. A rock can also contain organic remains and mineraloids apart from regular mineral formations.
Raja was a strong leader who used to govern, whereas Dasa or Dasi are captive slaves who once served their lords. This is how the lives of the two groups differed. Raja is able to make sacrifices, unlike Dasa or Dasis.
A slave was not autonomous, although a raja was. Rajas enjoyed respect due to their position of authority. But in most instances, a slave must have drawn jeers and sympathy.
The rajas had no cities, palaces, armies, or tax collection systems. In general, sons did not always succeed their fathers as rajas.
Later, the word evolved to refer to a slave or dasa. Men and women who were taken during the war became slaves. They were treated as the owners' property, and the owners had the right to demand that they perform any tasks.
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Helen Keller is a powerful role model because she resused to give up even when faced with extreme physical disabilities.
