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science
vocab
11
Science
8th Grade
10/20/2011

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Term
eon
Definition
the largest division of geologic time
Term
epoch
Definition
a subdivision of a geologic period
Term
era
Definition
a unit of geologic time that include two or more
Term
geologic time scale
Definition
the standard method used to divide the earch long natural history into manageable part
Term
cenozoic era
Definition
era that begin about 66 million year year ago, known''as the age of mammal
Term
extinction rate
Definition
the rate at which specise die
Term
mass extinction
Definition
occur when a large proportion of the earth   specise go extinct in a relatively short period of time
Term
mesosauras 
Definition
an example of a specise at support the continental drift theory
Term
mesozoic era 
Definition
era that 245 million year ago ,known as the age of diosaurs
Term
paleozoic era
Definition
era that began about 544 million year ago and almost lasted about 300 million year ago
Term
period 
Definition
a subdivision of the eras in geologic time
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