Science fossils
Terms
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- mold
- a hollowed out space int he shape of a once living organism OR when hard body parts leave a dent or depression in sediment that has already begun to harden
- cast
- when minerals move into and harden inside the space left by a decaying organism-always 3-D
- Step 1.
- The animal dies, falls to sea/lake bed-soft parts decomposed by bacteria-hard parts remain
- Step 2.
- Sediments continually fall down from the water above and settle on and around the skeleton
- Step 4.
- Water may dissolve the bones, leaving a mold fossil or fill the mold with minerals forming a cast fossil
- fossil
- any kind of ancient life preserved in a rock or other substance
- imprint
- when soft body parts such as leaves or feathers leave an impression in the rock
- petrified
- when the hard parts of a dead organism are changed to stone
- paleontologist
- a scientist who studies fossils
- intact
- when an entire animal is preserved in amber, ice, or ash, or tar (Jurassic park movie)
- Step 3.
- The sediments compact into rock, and water slowly replaces the chemicals in the bones with hard minerals