3.5 time marches on Flashcards
1
Q
the standard method used to divide the Earth’s long natural history into manageable parts
A
geologic time scale
2
Q
the largest division in time
A
eon
3
Q
a unit of geologic time into two or more periods
A
era
4
Q
a unit of geologic time into which eras are divided
A
period
5
Q
a subdivision of a geologic period
A
epoch
6
Q
the death of every member of a species
A
extinction
7
Q
this is the eon in which we live
A
Phanerozoic eon
8
Q
the first organisms with well-developed cells appeared
A
Proterozoic eon
9
Q
the earliest known rocks on Earth formed
A
Archean eon
10
Q
scientist found meteorites and rocks form the moon on Earth
A
Hadean eon
