The correct answer is - it's mass.
Jupiter is the biggest planet in our Solar System, but only the biggest, also it has the biggest mass by far from all the planets. Because of its very big mass Jupiter has a very strong gravitational pull. The strong gravitational pull contributes to the attraction and keeping of lots of bodies that can not escape it, instead they revolve around the planet. These objects, or space bodies, that the gravitational pull of the planet managed to trap, became the moons, or rather natural satellites, of Jupiter.
 
        
                    
             
        
        
        
Answer:
they occur at convergent plate boundaries 
 
        
             
        
        
        
Answer:
Lack of resources such as water, gas etc and proper place for living.
Explanation:
Lack of resources such as water, gas etc and proper place for living are the  problems that the people would face living in this part of Kolkata because this part is located at the edge of Kolkata. Due to far from city, no resources were provided by the government to this region which causes major problems to the people that are living there so due to located on the edge, experience more problems.