EARTH LAB: Fossils

Molds and Casts


Sea Shell or similar object


Plaster of Paris


  1. Firmly press the shell into clay
  2. remove the the shell from the clay
  3. fill the mold with plaster of paris
  4. when the plaster of paris has dried, carefully remove it from the clay

For Independent Project points, respond to the following

  1. Define mold.
  2. Define Cast.
  3. Which part of your project is the cast, and which is the mold?
  4. What have you learned from this lab?
  5. Provide evidence of your work – video, pictures, or the actual mold and cast.