Some where in the mountains, a river originates. It flows down to the low-lands and into the sea. It flows because of the slope and the gravity. River appears to run on a plane ground. But there is always a slight slope.
If one of the banks of a river is weak, the river burrows in and curves. The curved flow of water hits the opposite bank and curves again. It repeats on and on. That is why, all the rivers follow snake like path.
The river suddenly turns creating a whirlpool; it some times falls down creating waterfalls; it smashes on boulders and rocks; it splits up creating island; it finally enters ocean where again there is clash between land mass and waters. Consequently river split up into several branches creating delta region. Such a hard journey. The river's journey is similar to the human life.
The river is like conveyor belt. It cycles waters from ocean to clouds and back again. All the human settlement and civilizations started on the banks of rivers.
The electric currents flow through the wires, printed circuits and keep the gadget live and active. Similarly, the flowing rivers keeps the all life forms active. Hence rivers are always seen and cared with reverence.
Man's intervention: Man has built dams across rivers. The reservoirs are used for storing waters without letting everything into the sea. Power stations are built at the bottom of the dam. When the water rushes down into the power house, it pushes and rotates huge blades which in turn rotate a coil within a magnetic field generating electric power. Then the water flows forward to irrigate the paddy fields.
Rivers also serves as good transport system.
Let the rivers not run dry
Let us not engage in water wars.
Men may come;
Men may go;
I will go on forever
--- a river
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