Squeaky sand

Occasionally, during walks to the pier or the channel, you will tread across dry sand that "squeaks" as you walk. This is affectionately known as squeaky sand. This phenomenon only occurs with certain types of sand (e.g., silicates, carbonate of lime) with grains at a certain size (around 300 micrometers) create layers from the wind and moisture. The squeaking noise is caused from the friction of the layers rubbing against each other.

Also, it is noted that polluted sand will not squeak. If a beach doesn't squeak, it is because foreign matter has mixed in with the sand. This means that the beach at Pentwater is healthy and clean.