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Fossils
Term | Definition |
---|---|
Sedimentary rock | rock made of loose pieces of other rocks crushed together. |
Original remains | actuall body parts of organisims |
casts and molds | fossils made in sedimentary rocks |
petrified wood | Stone fossil of a tree |
fossil | Remains of living things from long ago |
ice core | a tublar sample that shows layers of snow and ice |
relative age | the age of an object or event in relatijon to other objects |
carbon films | a film that is left on a rock and shows soft parts of an animal |
trace fossils | not animal parts, rather evidence that an animal was there (foot print) |
Tree rings | something that shows the age of trees |
index fossils | fossils that existed for specific spans of time |
absolute age | the exact age of a object or event |
half life | the measurement of radioactive elements age |
geologic time scale | divides earths history into intervals of time |