3.5 Time marches on Flashcards
1
Q
The standard method used to divide the Earth’s long natural history onto manageable parts
A
Geological time scale
2
Q
The largest division of geologic time
A
Eon
3
Q
A unit of time that includes two or more periods of time
A
Era
4
Q
A unit of geological time into which eras are divided
A
Period
5
Q
A subdivision of geological time
A
Epoch
6
Q
The death of every member of a species
A
Extinction
7
Q
Earth is about 4.6 billion years old
A
Earth’s Age
8
Q
The Age of Reptiles is a period of ancient history when reptiles were the dominant creatures on the earth
A
Age of Reptiles
9
Q
The Cenozoic is also known as the Age of Mammals, because the extinction of many groups allowed mammals to greatly diversify
A
Age of Mammals
