A worm cast is a structure created by worms, typically on soils such as those on beaches that gives the appearance of multiple worms. They are also used to trace worm's location.

What causes worm casts?

Worm casts are created by earthworms. These worms consume and digest organic matter in the soil. They then expel it from their gut onto the soil surface. This creates the coil of smooth soil which we call worm casts.

What is worm cast?

a anything designed to be worn.