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 coprolite that formed in sedimentary rock by animal activity or on within soft sediment

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

a long cylinder of ice obtained from drilling through ice caps or ice sheets

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

The law of superposition is one of the principles of geology scientists use to determine the relative ages of rock strata, or layers.

a break in time in an otherwise continuous rock record

the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers.

a record of the rock layers in a particular area across geologic time.

to give rocks an actual date, or date range, in numbers of years

a method of dating rocks and minerals using radioactive isotopes

the time required for half of a given quantity of a material to undergo a process characterized by exponential decay.

a method of establishing how old something is – perhaps a wooden artefact, a rock, or a fossil – based on the presence of a radioactive isotope within it.

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unit 7

Question	Answer
uniformitaranism	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 coprolite that formed in sedimentary rock by animal activity or on within soft sediment
climate	the weather conditions in an are over a long period of time
ice core	a long cylinder of ice obtained from drilling through ice caps or ice sheets
relative dating	any method of determining whether an event or object is older o younger than other events or objects
superposition	The law of superposition is one of the principles of geology scientists use to determine the relative ages of rock strata, or layers.
unconformity	a break in time in an otherwise continuous rock record
fossil	the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers.
geologic columm	a record of the rock layers in a particular area across geologic time.
absolute datng	to give rocks an actual date, or date range, in numbers of years
radioactive dating	a method of dating rocks and minerals using radioactive isotopes
half life	the time required for half of a given quantity of a material to undergo a process characterized by exponential decay.
radiometric dating	a method of establishing how old something is – perhaps a wooden artefact, a rock, or a fossil – based on the presence of a radioactive isotope within it.

Created by: Ana Maria Ferrao

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