chain pump is traditional method of irrigation .write two other important source of energy
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coal and wood were the old methods to obtai energy
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Dear mates here is your answer
➡️Chain pump: A chain pump consists of two large wheels, connected by an endless chain. The bottom wheel is half immersed in the water source. ... The chain then carries the empty buckets back down to be refilled and the process continues. Moat or pulley-system: It is a manual irrigation method.
Two other sources of energy
Energy from photosynthesis can be renewable, in the form of biomass, biogas and biofuels, or fossil - as oil, gas and coal. Indirect solar energy is wind, hydroelectric or wave energy. The second energy source is the earth. It can be geothermal (heat) or nuclear energy.
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