Why are lightning strike more frequent in hilly areas ?

A student visits a Hill station in North India during the summer vacations. He observes that some of the people in that area have swollen necks. (a) Name the disease from which the people with swollen necks are suffering. What is the cause of this disease ? (C) why is this disease more prevalent in hilly areas ? (d) What should be done to prevent this disease ?

Statement -1: When lightning strikes a metal pipe, the pipe tends to contact. Statement-2: Parallel current attract each other.

Is the efficiency of a heat engine more in hilly areas than in plains?

How does sprinking of salt help in clearing the snow covered roads in hilly areas? Explain the phenomenon involved in the process.