Question

What are the main renewable energy sources? Why are ocean, wave, and tidal energies not considered as main renewable sources?

Answer 1

Explanation:

Renewable energy -

The energy source that does not get exhaust after using it , and can naturally replenish themselves .

These source of energy is naturally available and can be used with out limitation of being getting over .

The major types of renewable energy sources are  as follows -

• Geothermal  
• Solar  
• Wind  
• Hydropower  
• Biomass

Ocean , tide and wave are not the main renewable source , because , these are available only for certain time period , as tidal energy can be used only during high tides , similarly with the ocean and wave .