a principle that geologic processes that occurred in the past can be explained by current geologic processes

the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock

a fossilized structure, such as a footprint or a coprolite, that formed in sedimentary rock by animal activity on or within soft sediment

the weather conditions in an area over a long period of time

a long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates

any method of determining whether an event or object is older or younger than other events or objects

a principle that states that younger rocks lie above older rocks if the layers have not been disturbed

a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time

an ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom

any method of measuring the age of an event or object in years

the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element

the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope

a method of determining the absolute age of an object by comparing the relative percentages of aradioactive parent isotope and a stable daughter isotope (443)

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Unit 7

Term	Definition
uniformitarianism	a principle that geologic processes that occurred in the past can be explained by current geologic processes
Fossil	the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
Trace Fossil	a fossilized structure, such as a footprint or a coprolite, that formed in sedimentary rock by animal activity on or within soft sediment
Climate	the weather conditions in an area over a long period of time
Ice Core	a long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates
relative Dating	any method of determining whether an event or object is older or younger than other events or objects
superposition	a principle that states that younger rocks lie above older rocks if the layers have not been disturbed
Unconformity	a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time
Geologic Column	an ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom
Absolute Dating	any method of measuring the age of an event or object in years
Radioactive Decay	the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element
Half-life	the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
Radiometric Dating	a method of determining the absolute age of an object by comparing the relative percentages of aradioactive parent isotope and a stable daughter isotope (443)

Created by: Zailyn Alexander

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