1. Vocabulary Fossil Terms March 10-14, 2014

2. mold The shape of a once-living thing left in sediment when rock formed

3. cast A cast forms when mud or minerals fill a mold. The cast has the actual shape of the living thing

4. fossil The hardened remains of a plant or an animal that lived long ago

5. extinct Describes a kind of living thing that is no longer found on Earth

6. Trace fossil Fossils that are marks left behind from an animal

7. Petrified wood a type of fossil in which wood has turned to stone.

8. amber Hardened tree sap that can trap and fossilize insects

9. decompose When once living things break back down into natural substances

10. Ice Age A time when huge sheets of ice cover much of the land. Many plants and animals become extinct because they can not live in the cold weather