" (Geothermal Energy) "

Some renewable sources of energy are given below : solar energy, tidal energy, biogas energy, hydel energy , OTEC, wind energy, geothermal energy, ocean wave energy. Which of the given sources are more reliable and consistent in availability.

Which of the following group does not constitute fossil fuels ? A. Solar power, Wind power, Geothermal power B. Petrol, Coal, Diesel, Natural gas