Electricity produced by waterpower is
a. solar
c. biomass
b. geothermal
d. hydroelectric

Option (D)

Explanation:

The plant in which the electricity is produced by use of water is called hydroelectric power station.

Water is stored in huge dams and then allow to fall from a great height. The potential energy of stored water is converted into kinetic energy of the flowing water. Then this kinetic energy rotates the turbines and converted into mechanical energy and then finally the coil of generator rotates and electric energy is produced.

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

conservation of mass

mass before something happens = mass afterwards