What is the basic cause for winds to blow? Name a part of India where wind energy is commercially harnessed. Compare wind power and power of water flow in respect of generating mechanical and electrical energies. What is the hindrance in developing them?

(N/A) The basic cause for winds to blow is the uneven heating of the Earth's surface by the Sun's energy.
Kanyakumari in Tamil Nadu is a prominent part of India where wind energy is commercially harnessed.
Comparison:
$(i)$ Both wind power and flowing water power are renewable and pollution-free sources of energy.
$(ii)$ Both involve the conversion of kinetic energy into mechanical energy (e.g.,rotating turbines) and subsequently into electrical energy.
$(iii)$ The power of flowing water is generally more consistent and concentrated compared to wind power,making it more efficient for large-scale electricity generation.
Hindrances in development:
$(i)$ Wind energy: It is intermittent and not available everywhere. Wind farms require specific locations with high wind speeds for most of the year.
$(ii)$ Water energy: The construction of large dams causes significant ecological damage,displaces populations,and is limited to specific geographical locations with perennial rivers.