Choose the only renewable source of energy from the following:

Resources which can be used repeatedly over a long period of time without its shortage because they are constantly being replenished by nature are called as renewable resources, while those resources which are not are non-renewable. Coal, uranium & natural gas are non-renewable resources as they take thousands of years to get replenished. So the correct answer will be geothermal power which utilises the thermal energy stored in earth's crust.