| A | B |
|---|
| What is a MOLD? | A hollow impression left in sedimentary rock (like the indent of a shell or a hollow cupcake tin) |
| What is a CAST? | A solid copy of an organism (like a stone copy of a shell or the cupcake itself) |
| What are PRESERVED REMAINS? | When bugs or animals are trapped in amber or ice and preserved perfectly with little or no change |
| How is a MOLD formed? | This fossil is formed after organisms press into sediment. This is usually formed from hard parts of organism such as bones or shells. |
| How is a CAST formed? | This fossil is formed when sediment settles into a mold and turns into sedimentary rock, making a solid copy of the organism. |
| How is PRESERVED REMAINS formed? | This fossil can keep delicate parts of an organism in glaciers (ice), hardened tree sap (amber) or in tar. |
| Step 1 to making a fossil | Fishy-fishy dies & sinks to bottom of shallow body of water |
| Step 2 to making a fossil | Fishy-fishy's soft parts decompose as he is covered in sediment |
| Step 3 to making a fossil | The layers of sediment around fishy-fishy's hard parts compacts & cements into sedimentary rock |
| Step 4 to making a fossil | Weathering and erosion remove the layers of rock above the fossil, exposing it |
