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fossils
geologic time scale
Term | Definition |
---|---|
atmosphere | the gaseous portion of the planet |
eon | largest time unit on the geologic time scale |
fossils | remains or traces of organisms preserved from the geologic past |
geologic time scale | the division of earth's history into blocks of time |
glaciation | covered with or affected by a glacier |
igneous rock | rock formed by the crystallization of molten magma |
pangea | proposed supercontinent, which 200 mya began to break apart |
paleontologist | scientist who studies fossils and the history of life |
periods | basic unit of the geologic time scale that is a subdivision of an era |
phanerozoic eon | part of geologic time that is represented by rocks containing abundant (lots of various) fossil evidence |
plate tectonics | theory which proposes that earth's outer shell consists of individual plates which interact in various ways |
precambrian eon | all geologic time prior to the Phanerozoic eon |
radiometric dating | a complex procedure of calculating the absolute age of rocks |
relative dating | a form of dating by placing rocks in their proper sequence |