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(5th) Science
(5th) Science Ch.8 Fossils
Term | Definition |
---|---|
Fossil | Remains or traces of past life, often found in sedimentary rock |
Mold | Hollow space that is left when sediment hardens around the remains of an organism and the remains then dissolve |
Cast | Fossil formed when dissolved minerals fill a mold and harden |
Index Fossil | Fossil of an organism that lived in many places around the world for a short period of time; it can help scientists find the age of a rock layer |
Paleontology | Study of fossils |
Continental Drift | Theory that the continents have been slowly drifting apart for millions of years |
Organisms | Living things |
Pangea | Earth's huge landmass 225 Million years ago |
Petrified Wood | Tree or tree part that has turned into a fossil |
Trace Fossils | Animal makes tracks in the mud which harden and become rock over millions of years |
Carbon Film | Forms when heat and pressure force out most of the remains of a buried organism |
Relative Age | Age of a rock compared with the ages of other rocks |
Absolute age | Age of a rock in years |