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(5th) Science

(5th) Science Ch.8 Fossils

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