Question

mark and henery are marking exam papers each set takes mark 29 min and henry 1 hour express the rotio that mark and henry in the simplist form

Answer 1

Answer:

Hydroelectricity is electricity made by generators that are turned by the movement of water. It is usually made with dams that partly block a river to make a reservoir of water. Water is released, and the pressure of the dam forces the water down pipes that lead to a turbine.