Answer: 
Concentric circles are circles that share the same center. A pebble dropped in a pond creates concentric circles.
Explanation:
 
        
             
        
        
        
Answer:
Voltaire
Explanation:
Well it can't be John Lock, he is known for Natural Rights, Purpose of Gov't and Social Contract. 
It can't be Newton and I don't know who Kant is, so Voltaire would be your best bet.
 
        
             
        
        
        
An individual's private or personal information by which another person, business, or entity can use to reach the individual.