The standard method used to divide the Earth's long history into manageable parts

• relative age

• geologic time scale

• fossil record

• Permian extinction

Tags

NGSS.MS-ESS1-4

Age of bacteria

• relative age

• Permian extinction

• precambrian era

• Paleozoic era

Tags

NGSS.MS-LS4-1

Age of fish and amphibians

• extinction

• paleozoic era

• fossil record

• Precambrian era

Tags

NGSS.MS-LS4-1

method used to determine the age of rocks by comparing rocks with younger and older rock layers

• extinction

• fossil record

• relative age

• geologic time scale

Tags

NGSS.MS-ESS1-4

Greatest mass extinction of all time - ended the Paleozoic era

• extinction

• Paleozoic era

• geologic time scale

• Permian extinction

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Each rock layer is newer than the one below it

• law of superposition

• geologic time scale

• Permian extinction

• Paleozoic era

Tags

NGSS.MS-ESS1-4

a fossil that is used to establish the age of a rock layer because the fossil is distinct, abundant, and widespread and the species that formed that fossil existed for only a short span of geologic time

• index fossil

• fossil record

• fossil

• relative age

Tags

NGSS.MS-ESS1-4

A particular period in geologic history (for example Paleozoic, Mesozoic, Cenozoic)

• Cenozoic Era

• Period

• Epoch

• Era

Tags

NGSS.MS-ESS1-4

a group of organisms that are closely related and can mate to produce fertile offspring

• Fossil

• Paleozoic

• Era

• Species

Tags

NGSS.MS-LS3-2

NGSS.MS-LS4-4

age of mammals that lasted from 65 million years ago to the present; the era of modern life

• Cenozoic Era

• Mesozoic Era

• epoch

• period

Tags

NGSS.MS-ESS1-4