Geologic Time Scale Flashcards
1
Q
Eras are…
A
Geologist divide the time between Precambrian Time and the present into three long units of time called eras.
2
Q
Periods are…
A
Eras are subdivided into units of geologic time
3
Q
Geologic time scale is…
A
a record of the list forms and geologic events in Earth’s history.
4
Q
Invertebrates are…
A
Animals without backbones
5
Q
Vertebrae are…
A
An animal with a back bone
6
Q
Amphibians are…
A
An animal that lives part of it’s life in water and the rest on land.
7
Q
Reptiles are…
A
They have scaly skin and lay eggs with tough leathery shells.
8
Q
Mass extinction are…
A
When many types of living things become extinct at the same time.
9
Q
Mammals are…
A
A warm-blooded that fed their young with milk, appeared in Triassic Period.
