a principle that geologic processes that occured 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 the sedimentary rock.

a fossilized structure such as a footprint or a coprolite that is 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 an 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.

the 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 for a long

an ordered arrangment 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 processes 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 an sample of a radioactive isotope to break down by radioactive decay to from a daughter isotope.

a method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotope and a stable daughter isotope.

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unit 7 vocab science

Question	Answer
Uniformitarianism	a principle that geologic processes that occured 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 the sedimentary rock.
trace fossil	a fossilized structure such as a footprint or a coprolite that is 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 an 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	the 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 for a long
geological column	an ordered arrangment 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 processes 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 an sample of a radioactive isotope to break down by radioactive decay to from a daughter isotope.
radiometric dating	a method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotope and a stable daughter isotope.

Created by: Sailor Allen

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