| A | B |
|---|
| amber | fossilized sap that preserved entire organisms really well |
| mold | empty space in rock left when organism decays |
| imprint | objects like leaves and feathers leave an outline in soft sediment that then fossilizes |
| trace fossil | markings or evidence of animal activities; footprints, burrows... |
| cast | a mold that gets filled in by minerals |
| petrified fossil | when hard parts of an organism get replaced by minerals |
