When you strum a string of the guitar the string will vibrate and the molecules will move back and forth then it travels to your eardrums and then the electrical signal will go into your brain.
If you drop a stone into the pond the water will move out as the stone drops into the pond. The pond will lift higher than it was before. Like as if you fill a bowl with water and then leave you hand were the height is then put a cup into it and then you’ll see how higher it will be.
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