What can happen to the shells of marine creatures when they die?

When marine creatures die, their shells can undergo several fates. They may become part of the seafloor sediment, where they can contribute to the formation of new geological layers over time. Additionally, shells can be broken down by physical processes like wave action or biological processes involving scavengers and microorganisms, leading to their eventual dissolution. In some cases, shells can also be preserved in fossil form, providing valuable insights into past marine environments.