time
longest unit of geologic time
eon
the era of the dinosaurs is ______________
mesozoic
indirect evidence of an organism like a footprint
trace fossil
the deeper it is the older it is
superposition
an atom with extra neutrons
isotope
the mesozoic era is broken up into 3 ________________
periods
the era of humans is
cenozoic
the bodies at pompeii are an example of this type of fossil
relation between moving rock layers
cross cutting
an unstable element turning into a stable element
radioactive decay
shortest unit of geologic time
epoch
era of evolving sea life is _____________________
paleozoic
hardened tree sap
amber
an igneous fissure being younger than the layers it is cutting through is an example of
intrusion
the amount of time it takes to change half of an unstable element to a stable element
half life
the cenozoic is an example of an ________
era
period that the dinosaurs went extinct
cretaceous
process of bones turning into rocks
mineral replacement
eroded pieces of granite being older than the sandstone layer it is in is an example of
inclusion
process of measuring half life to find the exact age of an object
radiometric dating
3 MYA is___________
3 million years ago
epoch that the titanoboa existed
paleocene
fully preserved body an ice is an example of
mummification
sediment layers are stacked horizontally is an example of
horizontality
element we use to measure age of previously living things
carbon