A rock collection is a collection of rocks, minerals, and fossils that can be used for educational, scientific, or decorative purposes. An ALBUM is a collection of recordings, typically music, released as a single package on a CD, vinyl record, or another medium. A core sample is a cylindrical section of a rock or sediment taken from the Earth's subsurface for geological analysis. Collecting these items together creates a rock collection, which can be used to study the history of the Earth and its formation.