Answer:
A sinkhole lake forms by The formation begins with the subsurface dissolution of limestone, ultimately leading to surface collapse. As sediments are washed into the depression, the sinkhole becomes plugged.
 
        
                    
             
        
        
        
Answer:
Extreme temperatures - temperatures in the Thar Desert can exceed 50°C in the summer months. It is hard for people to farm, work in mines or as tourist guides during these months as it is simply too hot. This makes development difficult 
 
        
             
        
        
        
Soil liquefaction describes a phenomenon whereby a saturated or partially saturated  substantially loses strength and stiffness in response to an applied stress, usually earthquake shaking or other sudden change in stress condition, causing it to behave like a liquid.
        
                    
             
        
        
        
Answer:
 Because of the influence of colonial rule. There is also another reason: to unify all languages.
 
        
             
        
        
        
My point of view is if you were living waaayyyyy back then 
positive: 
- fresh water
- food
- fertile soil
- trading
- easier travel
- can connect cities
negative:
- flooding
- vulnerable to invasions 
- water could dry up
- seasonal changes