Why does sound travel faster in solids than in liquids, and faster in liquids than in gases?

Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense.

Explanation: The more dense something is, the faster sound will travel through the matter. I hope this was the answer you was looking for.

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the part of the wave he is travelling on is the crest