Question

Why are waves formed??

Answer 1

Any kind of disturbance triggers mechanical waves that propagate perpendicular to the motion of disturbance.

However for mechanical motion, it is necessary that the wave is propagated in a medium.


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Answer 2

Waves are most commonly caused by wind. Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest. ... The gravitational pull of the sun and moon on the earth also causes waves.