Preserved evidence of an organism, often found in sedimentary rock, that provides evidence of past life.

• fossil

• tooth

• epoch

• geologic time scale

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

scientist who studies fossils

• zoologist

• fossilologist

• paleontologist

• ecologist

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

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

• period

• radiometric dating

• law of superposition

• relative dating

states that the oldest layers of rock are found at the bottom and the youngest layers of rock are found at the top of a formation if the rock layers have not been disturbed.

• epoch

• law of superposition

• k-t boundary

• radiometric dating

Tags

NGSS.MS-ESS1-4

process used to determine the absolute age of rock or fossil by determine the ratio of parent nuclei to daughter nuclei within a given sample.

• period

• radiometric dating

• relative dating

• half-life

period of time it takes for a radioactive isotope, such as carbon-14, to decay to one-half of its original amount

• period

• era

• half-life

• epoch

Tags

NGSS.HS-PS1-8

record of Earth's history from its origin 4.6 bye to the present

• epoch

• geologic time scale

• period

• era

Tags

NGSS.MS-ESS1-4

time unit in the geological time scale, smaller than a period, measured in hundreds of thousands to millions of years.

• half-life

• epoch

• eon

• period

Tags

NGSS.MS-ESS1-4

third-largest time unit in the geologic time scale, measured in tens of millions of years.

• half-life

• era

• period

• eon

Tags

NGSS.MS-ESS1-4

second-longest time unit in the geologic time scale, measured in tens to hundreds millions of years, and defined by differences in life-forms that are preserved in rocks.

• Cambrian explosion

• era

• eon

• plate tectonics

Tags

NGSS.MS-ESS1-4