Match the following:

The correct answer is: I – b; ii – c, iii – d, iv – a

The correct option is a)I – b; ii – c, iii – d, iv – a.

• Flat solar collectors usually consist of large heat absorbing plates, usually large copper or aluminum plates, both of which are good conductors of heat and absorb as much solar radiation as possible for maximum efficiency. It is painted or chemically etched black.
• Tidal energy is renewable energy driven by the natural rise and fall of ocean tides and currents. Some of these technologies include turbines and blades. Tidal energy is produced by ocean waves during the ebb and flow of the tide.
• Geothermal energy is heat extracted from the earth. Water and/or steam carry geothermal heat to the surface. Depending on its nature, geothermal energy can be used for heating and cooling or for generating clean electricity.
• Fertilizer is called biomass and is fed regularly into closed tanks called fermenters. Anaerobic digestion takes place in these tanks in several stages until bacteria break down all the ingredients to produce methane and other gases.