Waves are created due to elastic properties of materials. When a part of the string gets disturbed, it exerts an extra force on the neighbouring part because of the elastic property. And this applied force contact results in the transfer of energy from one part of string to other part. And hence wave propagates.
Now, let's predict...
Imagine what would happen if surface tension is not there on water surface then if you drop a pebble on the surface of water then you will not see any ripple formation. Simple enough...
:)
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